In international chemical procurement, few naming ambiguities cause as much confusion as the phrase aluminium potassium sulfate. Enter this term into a search engine and you’ll encounter references to alum, potash alum, and sometimes even potassium sulfate (K2SO4) — creating a procurement headache for technical buyers across glass manufacturing, pharmaceuticals, agriculture, and water treatment. For sourcing professionals, mistaking aluminium potassium sulfate (KAl(SO4)2·12H2O) for premium potassium sulfate fertilizer can lead to costly errors in formulation, compliance failure, and supply chain waste. This comprehensive guide clarifies the chemical identities, solubility profiles, and distinct industrial roles of these two sulfates. It then focuses on why pure potassium sulfate from a reputable supplier like Hailei Chemical’s premium potassium sulfate (SOP) remains a strategic choice for high-value crop nutrition, glass fluxing, and aluminum recycling.
At the molecular level, aluminium potassium sulfate and potassium sulfate share little more than the sulfate anion. Understanding their structures immediately clarifies why one is an indispensable fertilizer and the other a workhorse in municipal water treatment.
This double sulfate of aluminum and potassium has been known for centuries. Its application spectrum extends from leather tanning to food-grade baking powder, but its defining industrial role lies in flocculation — the process of clarifying water by aggregating colloidal particles.
Unlike alum, potassium sulfate contains no aluminum and no water of crystallization. Its primary value is as a chlorine-free potassium source for premium agriculture and as a high-purity additive in demanding industrial processes. Hailei Chemical guarantees a minimum 50% K2O assay, low moisture, and consistent particle size distribution to meet the specifications of formulation-sensitive industries.
When evaluating a salt for industrial use, solubility behavior is among the first technical parameters examined. The search query “is potassium sulfate soluble” and “why is potassium sulfate soluble in water” reflects the practical needs of formulators who must predict dissolution rates, mixing compatibility, and storage stability.
Potassium sulfate is highly soluble in water, though not as hygroscopic as potassium chloride. At 20°C, approximately 111 g of K2SO4 dissolves per liter of water; solubility rises to about 120 g/L at 25°C and reaches 241 g/L at 100°C. This moderate solubility profile makes it ideal for controlled nutrient release in fertigation systems and for preparing stock solutions in glass or pharmaceutical manufacturing.
The solubility of potassium sulfate in water arises from the ionic nature of the compound and the high dielectric constant of water. When K2SO4 crystals contact water, polar water molecules hydrate the K+ and SO42− ions, overcoming the lattice enthalpy of the crystal. The resulting exothermic hydration energy is sufficient to break the ionic bonds, leading to dissolution. The absence of insoluble hydrolysis products (unlike some aluminum salts) means the solution remains clear and stable, a prerequisite for drip irrigation and pharmaceutical excipient use.
Potash alum also dissolves readily — roughly 140 g/L at 20°C — but its aqueous solution is acidic (pH ~3) due to partial hydrolysis of the aluminum ion. This acidity has both benefits (water treatment flocculation) and drawbacks (corrosivity to certain metals, incompatibility with some packaging materials). For buyers who require a neutral, non-acidic potassium salt, potassium sulfate is the unambiguous choice.
To fully appreciate why aluminium potassium sulfate generates such high search volume, one must understand its remarkably broad utility. Procurement teams sourcing for water treatment, food processing, or textile manufacturing often encounter this chemical under various trade names.
The most significant industrial use of alum is as a coagulant in drinking water purification and effluent treatment. When added to turbid water, hydrated aluminum species neutralize the negative charges on suspended particles, forming flocs that settle out. Municipalities globally consume vast tonnages; specification typically calls for Al2O3 content of 15–17% in commercial liquid alum, though potash alum powder is often preferred for small-scale plants due to easier handling.
Food-grade potassium alum (E522) acts as a firming agent for pickled vegetables, a leavening acid in baking powders, and a component of toothpaste. Pharmaceutical applications include astringent styptic pencils and adjuvant in vaccines. In all these uses, strict heavy-metal limits apply, mirroring the purity requirements that Hailei Chemical meets for its potassium sulfate customers in pharma production.
Alum tawing is an ancient technique that produces a white, soft leather used in glove making. In modern dyehouses, alum serves as a mordant, fixing natural dyes to wool and silk fibers. While synthetic alternatives exist, the low cost and predictable performance of potash alum sustain its niche.
From fire extinguisher compounds to paper sizing and fireproofing textiles, aluminium potassium sulfate retains a fragmented but essential presence. However, none of these uses overlap with the core functions of potassium sulfate — a point buyers must reinforce when issuing RFQs to avoid cross-shipments.
Shifting focus to the product that Hailei Chemical manufactures and exports at scale, the following sections detail the primary and secondary markets that depend on high-purity K2SO4.
The dominant market for potassium sulfate is agriculture. Many high-value crops — tobacco, citrus, grapes, potatoes, berries, and certain vegetables — are sensitive to chloride ions. Potassium chloride (MOP), while cheaper, introduces chloride that can reduce crop quality, burn leaves, and degrade soil structure over time. SOP’s chloride content is typically below 1.0%, making it the only safe potassium source for fertigation of such crops. Hailei Chemical’s granular SOP dissolves quickly in water, does not clog drip emitters, and supplies both potassium (50% K2O min.) and sulfur (18% S), a secondary macronutrient essential for protein synthesis and oil formation in seeds.
In specialty glass — particularly high-clarity container glass, television glass, and optical glass — potassium sulfate functions as a fining agent and stabilizer. It reduces the melting temperature of the batch, promotes bubble removal, and improves the refractive index. Glassmakers require a product with extremely low iron and heavy metals, consistent particle size (typically 200–325 mesh), and no caking. Hailei Chemical can tailor its SOP to meet these rigorous frits specifications, often supplying material that surpasses Chinese GB/T 20406-2017 standards.
In secondary aluminum production, a mixture of potassium sulfate and other halide salts forms a protective molten cover flux that prevents oxidation of the aluminum melt and absorbs inclusions. The sulfate component reacts with magnesium to form MgSO4, improving the cleanliness of the recovered metal. Recyclers value SOP with low sodium content and consistent reactivity. As aluminum recycling capacity expands in Europe and North America, the demand for premium potassium sulfate flux is rising steadily — creating a procurement opportunity for specialist importers.
Potassium sulfate appears in oral rehydration solutions, certain tablet formulations as a non-reactive filler, and as a buffering agent. The pharmaceutical industry mandates compliance with pharmacopoeial monographs (USP, EP, BP) that set limits on heavy metals, arsenic, and loss on drying. Hailei Chemical’s dedicated pharma-grade production line ensures batch-to-batch consistency and full documentation support.
In the construction sector, potassium sulfate accelerates the setting time of gypsum plaster and improves the mechanical strength of wallboard. The sulfate ion participates in the hydration reaction of hemihydrate to dihydrate, speeding up production line speeds. Wallboard manufacturers prefer a fine powder (typically < 100 µm) with minimal free moisture.
Given the phonetic similarity between “alum” and “SOP,” procurement errors occur more often than suppliers admit. To ensure you receive aluminium potassium sulfate when you actually need potassium sulfate — or vice versa — implement the following verification steps before issuing a purchase order.
Weifang Hailei Fine Chemical Co., Ltd. operates a modern SOP crystallization facility with an annual capacity exceeding 50,000 metric tons. Our production advantages translate directly into procurement benefits:
For buyers who have previously experienced shipment rejections due to mislabeled chemical identity, Hailei Chemical offers a transparent, test-based supply partnership. View detailed product specifications and packaging options on our potassium sulfate product page.
No. Potassium sulfate does not hydrolyze to form aluminum hydroxide flocs and therefore has no coagulation capacity. Conversely, potash alum cannot replace SOP as a chlorine-free potassium fertilizer because its aluminum content is phytotoxic at agronomic rates.
Yes. With a solubility of approximately 120 g/L at 25°C, potassium sulfate dissolves quickly and does not leave residues in irrigation lines when proper filtration is used. The neutral pH of the solution also prevents corrosion of metallic drip components, unlike acidic alum solutions.
SOP production requires more complex processing — either from natural ores like langbeinite via flotation or through the Mannheim process using sulfuric acid — whereas MOP is mined and refined more directly from sylvinite. The premium cost of SOP is justified by its chlorine-free composition, which preserves yield and quality in high-value crops that cannot tolerate chloride.
Weifang Hailei Fine Chemical Co., Ltd. specializes in potassium sulfate and related inorganic chemicals. While we do not produce potash alum, our technical team can recommend trusted sources if your requirement spans both products. For potassium sulfate inquiries, we invite you to contact us directly.
Whether you formulate specialty NPK blends for a fertilizer distributor, melt high-clarity glass, or produce aluminum deoxidation fluxes, the chemical identity of your raw material is non-negotiable. By understanding the clear boundary between aluminium potassium sulfate and genuine potassium sulfate, procurement professionals eliminate a major source of supply chain risk. Hailei Chemical stands ready to deliver consistent, high-purity SOP with the documentation and logistics support international buyers demand.
Request a competitive quote for granular or powder potassium sulfate, discuss your specification with our technical team, or arrange a representative sample shipment. Visit Get a Quote to start the conversation — our export desk responds within 24 hours.
For specialty fertilizer importers and distributors, selecting the right potassium source can make the difference between a thriving supply chain and costly crop damage. Among the most sought-after grades is 0-0-50 potassium sulfate—a premium, chlorine-free formula known in the industry as sulfate of potash (SOP). With a guaranteed minimum of 50% K2O, this high-purity fertilizer is indispensable for growers of chlorine-sensitive crops like tobacco, potatoes, grapes, tree nuts, and citrus. In this comprehensive guide, we unpack everything a professional buyer needs to know about 0-0-50 SOP: from deciphering quality parameters and comparing suppliers, to navigating logistics and verifying authenticity. If you’re building a reliable import program for potassium sulfate, this article will equip you with actionable insights you won’t find on a typical product data sheet.
The number sequence “0-0-50” is a fertilizer grade expressed in the standard N-P-K format, indicating the percentage by weight of nitrogen (N), phosphorus pentoxide (P2O5), and water-soluble potassium oxide (K2O). A 0-0-50 grade means the material contains no intentionally added nitrogen or phosphorus, and a guaranteed minimum of 50% K2O. In the case of potassium sulfate, the remaining mass consists of sulfate (SO42-) and minor impurities. This high concentration of potassium oxide makes 0-0-50 SOP one of the most efficient potassium carriers available, rivaled only by potassium chloride (MOP) which typically carries 60% K2O. However, the critical distinction lies in the accompanying anion: chloride versus sulfate. The “0” in nitrogen and phosphorus makes 0-0-50 potassium sulfate a straight potassium fertilizer, ideal for blending into compound NPK formulations or for direct application where only potassium and sulfur are required.
Many high-value crops—including tobacco, potatoes, berries, grapes, almonds, and citrus—are highly sensitive to chloride ions. Excess chloride can reduce crop quality, cause leaf scorching, interfere with water uptake, and lower marketable yields. Therefore, using potassium chloride (MOP) on these crops can be disastrous. That’s where 0-0-50 potassium sulfate comes in. By delivering potassium in a sulfate rather than chloride form, SOP eliminates the risk of chloride toxicity. Additionally, the sulfur component (typically around 17–18% S) is a secondary macronutrient essential for protein synthesis and enzyme function. Crops grown in sulfur-deficient soils show marked improvement when SOP is applied, making the 0-0-50 grade a dual-nutrient solution. For fertilizer importers servicing growers of high-value horticultural crops, offering a reliable source of 0-0-50 SOP not only meets a critical market demand but also builds long-term customer loyalty.
Not all SOP labeled “0-0-50” is equal. As a professional buyer, you must scrutinize the full product specification, not just the K2O content. Below are the essential parameters you should verify on every certificate of analysis (COA) when purchasing 0-0-50 potassium sulfate from any supplier.
The industry benchmark for premium SOP is a minimum of 50% K2O. Some lower-grade materials might assay at 48–49%, which can affect blend uniformity and application rate calculations. Always request a COA that clearly states the exact percentage. At Hailei Chemical, our 0-0-50 potassium sulfate consistently tests at ≥50.5% K2O, giving importers confidence in every shipment.
The whole point of choosing SOP over MOP is to avoid chloride. A top-quality 0-0-50 SOP should have a maximum chloride content of ≤1.0%, and preferably ≤0.5%. The Mannheim process (commonly used in China) can yield chloride levels as low as 0.3% if raw materials and process controls are tightly managed. Insist on a chloride guarantee in your supply contract.
Excess moisture leads to caking, handling difficulties, and nutrient dilution. Acceptable moisture is typically ≤1.0%. Powders may require lower moisture to maintain free-flowing properties; granular SOP can tolerate slightly higher moisture but still should not exceed 1.5%.
0-0-50 potassium sulfate is available in powder, granular, and sometimes crystalline forms. Granular SOP (2–4 mm) is preferred for bulk blending because it resists segregation and is easier to spread mechanically. Powdered SOP (<0.5 mm) is often used in water-soluble fertilizer and foliar applications. Clarify your target market’s usage patterns and specify the appropriate mesh size.
SOP has a solubility of about 110 g/L at 20°C, lower than MOP but still adequate for fertigation and foliar feeding. Finely ground powder dissolves faster. High-purity SOP should leave minimal insoluble residue. Insist on a water-insoluble limit of ≤0.1% for specialty applications.
In pharmaceutical or glass-grade applications, trace heavy metals such as lead, arsenic, and cadmium must be strictly controlled. Even for agricultural use, European and Japanese buyers often demand heavy metal certifications. Hailei Chemical offers pharmaceutical-grade potassium sulfate with heavy metals in compliance with EP/USP standards.
Good SOP has a near-neutral pH (typically 6–8 in a 5% solution). Excess free sulfuric acid can cause packaging corrosion and handling hazards. The specification should include a maximum free acid (as H2SO4) of ≤0.5%.
China is the world’s largest producer and exporter of potassium sulfate, supplying well over half of the global demand. With numerous factories in Shandong, Qinghai, and Xinjiang, importers have plenty of options—but also face quality variability, logistical complexities, and language barriers. Here is a practical framework for vetting Chinese suppliers of 0-0-50 potassium sulfate.
The Mannheim process (reacting potassium chloride with sulfuric acid in a high-temperature furnace) is the dominant method for producing SOP in China. It yields a material with K2O ≥50% and low chloride. Some producers also extract SOP from natural salt lake brines in Qinghai, which can offer a lower carbon footprint but may have slightly different crystal habits. When sourcing, ask for the production method; Mannheim-process SOP is generally more consistent in quality and particle morphology.
Request the following from any prospective supplier:
Never rely solely on a supplier’s own COA. Arrange for a pre-shipment inspection (PSI) by an independent agency, and have samples drawn according to international standards (e.g., ISO 3963 for fertilizer sampling). Test for all parameters above, and if possible, seal a retain sample for future reference.
Your purchase contract should clearly state the quality specification as a guarantee, not merely a “typical analysis.” Include allowance for rejection if K2O falls below 49.5% or chloride exceeds 1.5%, for example. Also specify the method of analysis (e.g., AOAC, EN, or GB standard).
At Hailei Chemical’s potassium sulfate production line, we manufacture 0-0-50 SOP using the state-of-the-art Mannheim process with strict quality controls. Our annual capacity of 80,000 metric tonnes allows us to serve fertilizer distributors, glass manufacturers, and pharmaceutical companies across more than 40 countries. Each batch is tested for at least the following:
We provide full technical documentation, a mill certificate with every lot, and support third-party inspection at our factory in Shandong or at the port of loading. Many of our long-term clients rely on our consistent 0-0-50 potassium sulfate to feed blending plants across Southeast Asia, Latin America, and Africa. Explore the full product specifications and request a sample.
Transporting 0-0-50 SOP from China to your destination port involves careful planning. The material is non-hazardous and does not require special transport classification, but its hygroscopic nature demands moisture-proof packaging. Standard packaging options include 25 kg PE-lined woven bags, 50 kg bags, or 1000–1250 kg jumbo bags. For buyers with bulk handling facilities, we can also supply in 20’ or 40’ bulk containers using liner bags. A 20-foot container can hold approximately 25–27 metric tonnes in bags, or 22–24 tonnes in bulk bags. Lead times from Shandong ports are typically 15–25 days to major Asian ports, 30–35 days to Europe, and 40–50 days to South America. Always factor in ocean freight volatility and insurance. Hailei’s logistics team can arrange FOB, CIF, or CFR terms with trusted carriers to ensure on-time delivery.
While your customers are the end users, understanding typical application rates helps you position 0-0-50 potassium sulfate effectively. For field crops like potatoes, SOP is applied at 150–300 kg/ha, supplying 75–150 kg K2O/ha plus 25–50 kg S/ha. For drip-irrigated vegetables, a water-soluble powder form is injected at 20–50 ppm K. For tree crops, annual application rates of 1–2 kg per tree are used. Given the typical price premium of SOP over MOP (often 30–50% higher per unit of K2O), importers can command higher margins in specialized markets. By demonstrating the tangible yield and quality benefits to growers, you can build a value-added distribution business around premium SOP.
| Parameter | 0-0-50 Potassium Sulfate (SOP) | 0-0-60 Potassium Chloride (MOP) |
|---|---|---|
| K2O content | ≥50% | ≥60% |
| Chloride | ≤1.0% (typically <0.5%) | ~47% Cl |
| Sulfur (S) | ~17-18% | 0% |
| Solubility (g/L at 20°C) | ~110 | ~340 |
| pH effect | Neutral to slightly acidic | Neutral |
| Main use | High-value, Cl-sensitive crops | Field crops tolerant to Cl |
| Cost per unit K2O | Higher | Lower |
Importers should note that while SOP is more expensive, its ability to access specialty crop segments and command premium pricing often yields better net profitability than competing on price with MOP. Furthermore, as global demand for nutritious and high-value foods rises, the SOP market is projected to grow at 4–5% CAGR, outpacing MOP.
Yes, granular SOP is fully compatible with most granular N and P fertilizers in bulk blends. Its density matches well, minimizing segregation. However, avoid blending with calcium nitrate unless used immediately, as calcium sulfate may precipitate over time.
No. Potassium sulfide (K2S) is an entirely different chemical compound used in leather processing and pyrotechnics. It is not suitable as a fertilizer and can be dangerous if mishandled. When importing, always verify you are buying potassium sulfate (K2SO4), not potassium sulfide.
The molecular weight of K2SO4 is 174.26 g/mol. While this is a fundamental chemical property, the more important metric for fertilizer buyers is the K2O equivalent—potassium sulfate has a theoretical K2O content of 54%, though commercial grades are typically 50% due to manufacturing processes.
Aluminium potassium sulfate (potassium alum) is a double salt used in water treatment, baking powder, and cosmetics. It is not directly interchangeable with 0-0-50 potassium sulfate fertilizer, though potassium sulfate itself is used as a pharmaceutical excipient and in glass manufacturing. If you are sourcing for those non-fertilizer applications, check the relevant powder specifications; we also supply high-purity grades for these industries.
Selecting the right 0-0-50 potassium sulfate supplier is a decision that impacts your entire fertilizer product line. With consistent assay, low chloride, and industry-recognized quality, Hailei Chemical is ready to be your long-term partner. Whether you need a full container of granular SOP for blending or a multi-container shipment of pharmaceutical-grade powder, we have the production capacity and export experience to meet your demands.
Visit our 0-0-50 Potassium Sulfate product page to download the latest specification sheet and MSDS, or request a competitive quote today. Our sales team will respond within 24 hours with a tailored offer, including current FOB/CIF prices, packaging options, and lead times. Don’t settle for uncertain quality—choose Hailei Chemical as your trusted source for potassium sulfate.
For procurement managers and agronomists asking where to buy potassium sulfate fertilizer that consistently meets purity, solubility, and chlorine-free standards, the answer lies in partnering with a manufacturer that combines technical expertise with global logistics. Potassium sulfate (K2SO4), also known as sulfate of potash (SOP), is the preferred potassium source for high-value, chloride-sensitive crops and numerous industrial processes. This comprehensive guide examines every facet you need to evaluate before committing to a bulk purchase—from chemical specifications and regional production hubs to price determinants and quality verification protocols.
With decades of fine chemical manufacturing experience, Weifang Hailei Fine Chemical Co., Ltd. delivers potassium sulfate that exceeds industry benchmarks for agriculture, glass, aluminum recycling, and pharmaceuticals. Whether you import container loads for fertilizer blending or require technical-grade K2SO4 for specialized manufacturing, understanding the nuances of the global SOP market is essential to securing a reliable, cost-effective supply.
Potassium sulfate is an inorganic salt with the formula K2SO4, appearing as a white, crystalline powder or granular solid. Unlike the more common potassium chloride (MOP), it contains virtually no chloride, making it indispensable for crops like tobacco, potatoes, citrus, grapes, and berries where chloride toxicity can ruin yield and quality. In industrial settings, its high melting point (1069°C) and fluxing properties enable applications from glass refining to aluminum salt bath treatments.
Agricultural-grade potassium sulfate typically guarantees a minimum K2O content of 50%, with premium sources reaching 51–52%. The chloride content must remain below 0.5% by weight, and many buyers demand even tighter specifications of ≤0.2% Cl. Hailei Fine Chemical’s standard product meets K2O ≥ 50.5%, Cl ≤ 0.2%, with moisture under 0.5%. These figures align with ISO 17318:2015 for SOP fertilizers and ensure maximum nutrient uptake without soil salinization.
Buyers choose between granular, powder, and water-soluble crystal forms depending on application. Granular potassium sulfate (2–4 mm) is ideal for bulk blending and broadcast spreading. Fine powder (100–325 mesh) is preferred for fertigation concentrates, foliar sprays, and industrial formulations. Water-soluble SOP with dissolution rates above 99% in 5 minutes supports hydroponic and drip irrigation systems. Confirm your supplier’s ability to customize particle size distribution and provide sieve analysis certificates.
Global SOP demand is driven by the shift toward precision agriculture and high-value horticulture. Chloride-induced stress can reduce photosynthesis, burn leaf margins, and depress fruit set. When farmers apply SOP, they gain multiple agronomic benefits without the risks associated with muriate of potash.
These agronomic advantages translate directly into procurement specifications: any supplier claiming to meet the “chlorine-free” label must provide third-party lab analysis and maintain batch consistency throughout the season.
SOP production is concentrated in regions with accessible potassium-bearing minerals or established Mannheim process infrastructure. Major exporters include Germany, Belgium, China, Egypt, and the United States. China has expanded its capacity significantly, positioning itself as a flexible, cost-competitive source for international buyers. When evaluating where to buy potassium sulfate fertilizer, consider these sourcing dimensions:
When you narrow down potential sources, a structured supplier audit reduces risk. Request the following documentation and verify claims independently:
Hailei Fine Chemical routinely provides pre-shipment COAs verified by independent surveyors, giving buyers confidence in every FCL or break-bulk shipment.
The market price potassium sulfate fluctuates based on input costs, energy, freight, and seasonal agricultural demand. A typical FOB China price for granular SOP (K2O 50%) can range between $500 and $700 per metric ton, though tight potassium chloride feedstock and sulfuric acid costs can push it higher. Buyers can achieve better pricing through long-term contracts, volume commitment, and flexible delivery scheduling.
Instead of simply comparing unit prices, evaluate total landed cost including import duties, port handling, and inland delivery. Request price breakdowns, force majeure clauses, and quality adjustment terms. A supplier that offers price lock-in for 3–6 months can stabilize your production budget. At Hailei, we work with importers to structure flexible payment terms and volume discounts—contact our sales team for a tailored offer based on your annual off-take.
While agriculture dominates SOP consumption, industrial applications create substantial niche demand. Understanding these uses helps multi-sector buyers identify a single supplier capable of meeting diverse technical specifications.
Potassium sulfate serves as a fining agent and flux in specialty glass, including optical lenses, television screens, and solar panel glass. It lowers melting temperature, removes bubbles, and improves refractive index uniformity. High-purity K2SO4 with minimal iron (<50 ppm) and other colorant metals is non-negotiable for clear glass. Particle size consistency ensures homogeneous melting kinetics.
In secondary aluminum smelting, potassium sulfate is a component of salt flux blends designed to protect molten metal from oxidation, strip impurities, and coalesce aluminum droplets. This application requires close control over carbonate and chloride traces to prevent gas defects in final alloy. A frequently asked question—“what is potassium aluminum sulfate used for”—often arises because of nomenclature overlap. Potassium aluminum sulfate, or alum, has the formula KAl(SO4)2·12H2O and is applied in water treatment, paper sizing, and food pickling. It is entirely different from potassium sulfate (K2SO4). In aluminum recycling, the sulfate ion of K2SO4 helps form a protective molten salt cover, while the potassium contributes to flux fluidity; no aluminum is present in the chemical itself. Ensuring you order the correct compound prevents costly formulation errors. If you need aluminium potassium sulfate formula confirmation, remember that alum is KAl(SO4)2·12H2O, whereas technical SOP remains simply K2SO4.
Potassium sulfate is listed in pharmacopoeias (Ph. Eur., USP-NF) as an excipient used to adjust osmotic pressure and as a tableting filler. While consumers often search “what does taking potassium benefit,” referencing potassium’s role in nerve transmission and muscle contraction, they are usually referring to potassium chloride or citrate supplements. In pharmaceutical manufacturing, K2SO4’s low toxicity and inertness make it suitable for tablet blends, dialysis solutions, and veterinary infusion fluids. Hailei’s pharma-grade SOP meets endotoxin and microbial limits with a purity exceeding 99% on a dry basis.
A thorough pre-shipment inspection program is the bedrock of trust in international chemical trade. From sampling to loading, buyers should insist on transparent protocols that align with GAFTA, FOSFA, or ISO 2859 standards.
Moisture ingress during sea transit can cake powder and promote microbial growth. Specify PE inner liners, desiccant bags, and sealed containers. For bulk vessel shipments, ensure watertight hatches and hold cleanliness. Hailei’s export team coordinates with SGS-certified surveyors to witness sampling, verify packaging strength, and issue a clean report of findings before vessel departure.
A large European fertilizer distributor had suffered repeated complaints from berry growers due to leaf scorch traced to chloride levels exceeding 1% in their previous SOP source. After auditing three Chinese manufacturers, they selected Hailei based on our demonstrable Cl ≤ 0.2% consistency across 20 consecutive batches. Through direct FCL shipments with on-board COAs, the importer reduced quality claims to zero within one season, strengthening their retailer relationships and gaining exclusive regional distribution rights for Hailei’s premium SOP. This success underlines why rigorous supplier qualification directly impacts downstream profitability.
When you decide where to buy potassium sulfate fertilizer, choose a partner that views your success as its own. Weifang Hailei Fine Chemical Co., Ltd. brings together advanced Mannheim production lines, ISO-certified quality management, and a customer-centric export department. Our standard potassium sulfate (K2O ≥ 50.5%, Cl ≤ 0.2%) is available in granular, powder, and soluble forms, and we can tailor particle size, packaging, and documentation to your market requirements.
Don’t settle for suppliers that compromise on purity or transparency. Explore our potassium sulfate product page for detailed specifications and technical data. Ready to secure a competitive quote? Submit your inquiry now and a dedicated account manager will respond with pricing, MOQ, and delivery options within one business day.
When sourcing specialty chemicals for industrial applications—whether for water treatment, glass production, or high-value agriculture—the Material Safety Data Sheet (MSDS) is not just a formality. For procurement managers and chemical engineers, the potassium aluminum sulfate MSDS serves as the foundational document that ensures regulatory compliance, workplace safety, and product consistency. At Hailei Chemical, we understand that navigating technical documentation across international supply chains can be challenging. This guide breaks down exactly what a potassium aluminum sulfate MSDS should contain, how it differs from related documents for potassium sulfate, and what buyers should look for when evaluating the true cost and safety of chlorine-free potassium salts.
Potassium aluminum sulfate—commonly known as alum or potash alum—is an inorganic double salt with the formula KAl(SO₄)₂·12H₂O. It is widely used as a flocculant in water purification, a mordant in textile dyeing, a leavening agent in baking powder, and a component in fire extinguishers. In many industrial contexts, it serves as an alternative or complement to the chlorine-free potassium fertilizers that Hailei Chemical exports globally. While potassium aluminum sulfate and potassium sulfate (sulfate of potash, the potassium sulfate common name) share the sulfate anion, their cation composition makes them suitable for very different end uses. Potassium sulfate (K₂SO₄) with a minimum K₂O of 50% is primarily a premium fertilizer for chloride-sensitive crops like tobacco, grapes, and citrus. In contrast, aluminum-based alum is rarely used in agronomy due to its aluminum content, which can be phytotoxic. Instead, it finds its niche in municipal and industrial water treatment, papermaking, and pharmaceutical manufacturing.
Buyers seeking a chlorine-free potassium salt for fertilizer blending will naturally encounter the price of potassium sulfate fertilizer alongside quotes for alum. However, the two products are not interchangeable. Understanding the distinct chemical properties, safety requirements, and market pricing is critical for making a cost-effective and compliant sourcing decision. This is where the MSDS becomes the universal passport for international chemical shipments.
An MSDS—now more commonly referred to as a Safety Data Sheet (SDS) under the Globally Harmonized System (GHS)—is a 16-section document that communicates the hazards, handling procedures, and emergency control measures for a chemical substance. For importers and bulk purchasers, the potassium aluminum sulfate MSDS offers several layers of assurance:
When you request a quote for price potassium aluminum sulfate, always ask for a current MSDS alongside the commercial invoice. Reputable suppliers like Hailei Chemical provide SDSs that are updated in accordance with the latest GHS revision, verified by third-party laboratories, and available in multiple languages. This proactive approach minimizes supply chain disruptions and protects your company from liability.
A thorough supplier evaluation goes beyond a cursory glance at the document. Here are the critical sections of a potassium aluminum sulfate MSDS that demand careful review:
Potassium aluminum sulfate is generally classified as a mild irritant. The GHS hazard statements typically include H315 (Causes skin irritation) and H319 (Causes serious eye irritation). For granular or powdered forms, the dust may also carry an H335 (May cause respiratory irritation). Compare these classifications with your existing workplace risk assessments. If you handle large volumes in enclosed spaces, ensure the supplier includes appropriate engineering control recommendations in Section 8.
This section must list potassium aluminum sulfate dodecahydrate as the primary component, often with a purity range (e.g., ≥99.5% on a dry basis). Trace impurities such as iron or heavy metals should be disclosed. For pharmaceutical-grade alum used as an excipient, purity specifications are far tighter—typically meeting USP, EP, or BP monographs. If your application demands high purity, cross-reference this section with the certificate of analysis (COA).
Key parameters include appearance (white crystals or powder), pH (typically 3.0–4.0 for a 10% aqueous solution), melting point, and bulk density. For international logistics, the bulk density is essential for calculating container loading volumes. At Hailei Chemical, we optimize packing—whether in 25 kg bags, 1000 kg supersacks, or bulk—based on these exact physical properties to maximize freight efficiency.
Potassium aluminum sulfate is not classified as a dangerous good under ADR, IMDG, or IATA regulations for most forms. However, certain hydrated forms or mixtures may require environmental hazard labeling (UN 3077) if they contain ecotoxic impurities. A correctly prepared MSDS will state “Not regulated” or provide the appropriate UN number. This directly influences your freight cost and documentation requirements. Always confirm this section matches your logistics provider’s expectations.
For buyers considering both alum and sulfate of potash, a side-by-side comparison clarifies which product fits their operational needs. While the price of potassium sulfate fertilizer is often benchmarked against global MOP (muriate of potash) indices, chlorine-free SOP (sulfate of potash) commands a premium due to its specialized production process and controlled solubility. In contrast, the price potassium aluminum sulfate is more closely tied to aluminum hydroxide and sulfuric acid markets, as well as regional demand for water treatment coagulants.
From a safety documentation standpoint, the MSDS for potassium sulfate (K₂SO₄) is notably simpler: it is non-hazardous, non-flammable, and does not require extensive hazard statements. That makes it a low-regulatory-burden product ideal for bulk agricultural distribution. However, the absence of hazard does not eliminate the need for an MSDS; it simply means the document focuses on safe handling practices, spill containment, and ecological information. At Hailei Chemical, we supply both potassium sulfate for premium fertilizer applications and can advise on alum sourcing through our network, ensuring all documentation—including the potassium aluminum sulfate MSDS—meets the strictest international standards.
A common procurement mistake is evaluating chemical pricing purely on a per-metric-ton basis without factoring in the total cost of ownership (TCO) implied by the MSDS. For example, a low price potassium aluminum sulfate might come from a supplier whose MSDS reveals a higher moisture content or a lower purity that will increase your formulation costs. Similarly, if the MSDS indicates the product is classified as a marine pollutant, you may incur higher freight and insurance charges that erode any apparent savings.
When you inquire about the price of potassium sulfate fertilizer, always request the corresponding SDS for the exact grade being offered—water-soluble powder, granular, or technical grade. At Hailei Chemical, our quotations include a link to the current MSDS for that specific lot, so you can verify compliance before committing to a purchase order. This transparency reduces risk and builds long-term supply chain resilience.
Whether you are importing alum for a municipal water plant or SOP for a vineyard, apply this ten-point checklist to every supplier evaluation:
As a leading Chinese exporter of potassium sulfate and a partner for chlorine-free chemical solutions, we recognize that the potassium aluminum sulfate MSDS is more than a regulatory artifact—it is a trust-building tool. Our in-house quality team continuously monitors GHS revisions across our target markets in Southeast Asia, Latin America, and the Middle East, ensuring that every safety data sheet we provide is not only accurate but also culturally and linguistically appropriate. For customers sourcing our high-purity potassium sulfate (K₂O ≥50%), this means receiving an SDS that seamlessly integrates with their local hazard communication programs, accelerating product registration and market entry.
Moreover, we offer technical support to help procurement teams interpret MSDS data and map it against their specific industrial application—be it glass manufacturing, aluminum recycling, or pharmaceutical excipient production. By choosing a supplier that values comprehensive documentation, you reduce the risk of costly non-compliance issues and position your supply chain for sustainable growth.
Whether you need potassium sulfate for chloride-sensitive crops or require guidance on chlorine-free alternatives like potassium aluminum sulfate, Hailei Chemical delivers both product quality and documentation integrity. Contact our team today to request a current potassium aluminum sulfate MSDS, a detailed specification sheet for our potassium sulfate, or a competitive price quotation tailored to your annual volume and destination port. Visit our quote request page or reach out through our regional representatives to start a partnership built on safety and reliability.
For procurement managers and chemical engineers sourcing potassium sulfate (K2SO4), understanding the benefits of potassium is only the first step. The real challenge lies in identifying a supplier that delivers premium-grade material meeting exact specifications—whether for chloride-sensitive crops, pharmaceutical preparations, or flat glass manufacturing. This comprehensive guide examines the critical quality parameters, solubility behavior, and industrial applications of potassium sulfate, and provides a structured framework to evaluate suppliers, ensuring your supply chain delivers consistent value.
Potassium sulfate, often called sulfate of potash (SOP), is a white crystalline powder or granular material prized for its low chloride content and high nutrient density. As a leading Chinese chemical exporter, Weifang Hailei Fine Chemical Co., Ltd. produces K2SO4 that meets rigorous international standards. But before you place an order, you need to know what separates a reliable supplier from a costly risk. Read on to learn the specifications, avoid common confusion with alum, and make informed procurement decisions.
Potassium is one of the three primary macronutrients for plants, alongside nitrogen and phosphorus. In agriculture, the benefits of potassium include enhanced drought resistance, improved stalk strength, increased fruit size and quality, and better nitrogen utilization. Unlike potassium chloride (MOP), the sulfate form adds no harmful chlorides, making it ideal for tobacco, potatoes, citrus, grapes, and many other high-value crops. But potassium’s industrial benefits extend far beyond farming.
In glass manufacturing, potassium oxide (K2O) derived from potassium sulfate acts as a powerful flux, lowering the melting temperature of silica and reducing energy consumption. The resulting glass exhibits superior clarity, thermal shock resistance, and workability—qualities essential for flat glass, optical lenses, and specialty containers. For aluminum recyclers, potassium sulfate is a key component of salt flux formulations that separate molten aluminum from oxide dross, improving metal recovery rates by up to 5%. In the pharmaceutical sector, high-purity K2SO4 serves as an excipient and an active ingredient in osmotic laxative preparations. Even gypsum board producers incorporate potassium sulfate to enhance fire resistance and mechanical bonding. Recognizing these diverse uses underscores why buyers must demand stringent quality—every application depends on consistent composition.
When evaluating bulk potassium sulfate shipments, specification sheets reveal the true value. Here are the parameters every industrial buyer should scrutinize:
By aligning these specs with your end-use, you can compare quotations on an equal footing and avoid “cheap” suppliers who compromise on hidden parameters.
Potassium sulfate solubility in water is a key physical property that directly impacts manufacturing and formulation. At 25°C, K2SO4 dissolves to about 120 grams per liter; at 100°C, solubility rises to roughly 240 g/L. This moderate solubility is intentionally designed for controlled nutrient release in fertigation systems and for creating stable solutions in industrial batches.
For liquid fertilizer producers, achieving a concentrated SOP stock solution requires warm water (40–50°C) and continuous agitation. In contrast, potassium chloride dissolves at much higher concentrations (>340 g/L at 20°C), so substituting K2SO4 without adjusting process parameters can lead to incomplete dissolution and clogged nozzles. Understanding this characteristic helps you design mixing protocols and select the right particle size.
In the pharmaceutical sector, solubility determines the efficacy of products such as sodium sulfate potassium oral solution, a colonic lavage preparation used before colonoscopies. This medication relies on a precise blend of sodium sulfate, potassium sulfate, and magnesium sulfate; the potassium component must dissolve completely to achieve the correct osmotic balance without causing gastrointestinal discomfort. Manufacturers sourcing potassium sulfate for such formulations should request dissolution rate data and ensure a fine, crystal-clear powder with minimal insoluble residue. Even trace impurities can affect solution stability and patient safety.
A practical tip: ask your supplier for a solubility curve or perform a rapid dissolution test upon receipt of pre-shipment samples. A product that leaves excessive sediment or takes too long to dissolve could indicate caking, coarse particle clumps, or foreign matter.
The versatility of sulphate of potash uses extends well beyond commodity fertilizer. Here’s a snapshot of the most demanding applications:
As the global focus shifts to food quality and sustainability, SOP is gaining ground over MOP in fruit orchards, vineyards, greenhouses, and organic-certified programs. Its negligible chloride content prevents leaf burn and toxicity in sensitive crops like avocadoes, berries, and tea. Moreover, sulfate sulfur contributes to protein synthesis and enzyme activation, making SOP a dual-nutrient premium input.
Potassium sulfate introduces potassium oxide into the glass batch, refining the melt and improving viscosity control. This is critical for producing thin display glass, borosilicate items, and specialty lighting. Even small variations in K2O content can alter expansion coefficients, so glassmakers often specify custom blends and tight tolerances.
In secondary aluminum smelters, a salt flux containing potassium sulfate promotes separation of aluminum from magnesium, calcium, and other impurities. The sulfate radical reacts with sodium and magnesium to form slags that are easily skimmed off, raising the yield of pure aluminum. Consistent flux composition is vital; a shift in raw material quality can disrupt the metal recovery process.
Beyond colonoscopy preps (sodium sulfate potassium oral solution), USP-grade potassium sulfate is used as a bulking agent in tablet manufacturing and as a mineral supplement in certain intravenous solutions. Regulatory oversight demands full traceability and a Drug Master File (DMF) from the supplier.
Potassium sulfate modifies the crystal structure of gypsum during hydration, enhancing core strength and fire resistance. This niche but growing application requires a pure, dry powder free from heavy metal contaminants that could affect board performance or workplace safety.
Each use case imposes distinct quality requirements, so a one-size-fits-all product rarely suffices. Work with a supplier who can tailor specifications to your exact process needs.
A frequent source of confusion for importers is the similarity in names between potassium sulfate and anhydrous potassium aluminum sulfate (also called potash alum or aluminum potassium sulfate). While both are white crystalline salts, their chemistry and applications diverge sharply.
Anhydrous potassium aluminum sulfate (CAS 10043-67-1) is a double salt with aluminum and potassium cations combined with sulfate. It’s primarily used in water treatment as a flocculant, in leather tanning, as a mordant in dyeing, and as a leavening agent in baking powder. The aluminum content makes it unsuitable for fertilizer—aluminum is toxic to plant roots at even moderate concentrations, and its presence would ruin a fertilizer’s value proposition. Mixing up these two products can lead to catastrophic crop failures, product liability claims, and regulatory penalties.
Potassium sulfate (CAS 7778-80-5), on the other hand, contains no aluminum and is the go-to chloride-free potassium source. Before issuing a purchase order, confirm the CAS number, request a chemical analysis, and clarify the intended application with your supplier. A reputable supplier like Hailei Chemical will provide clear documentation and never substitute lower-cost alum for SOP.
Moving beyond technical specs, a structured supplier assessment can save you from costly disruptions. Use these seven questions as a checklist when engaging new potassium sulfate sources:
By methodically addressing these questions, you build a supplier profile that mitigates risks and aligns with your long-term sourcing strategy.
Weifang Hailei Fine Chemical Co., Ltd. places transparency, technical expertise, and consistent quality at the core of every transaction. Our Potassium Sulfate is manufactured under stringent process controls, confirming K2O ≥50%, chloride <0.5%, and full water solubility with minimal insolubles. Whether you need granular SOP for bulk blending, fine powder for pharmaceutical formulation, or customized particle distribution for specialty glass, we have the flexibility to serve your requirements.
Our technical team understands the nuances of international logistics—moisture-proof packaging, container fumigation, and document preparation (COA, MSDS, certificate of origin). We support clients throughout the pre-purchase, sampling, and after-delivery phases, ensuring a seamless import experience. With ISO 9001 certification and REACH registration (when applicable), Hailei Chemical is positioned as a reliable partner for buyers in over 30 countries.
When you choose us, you gain more than a chemical shipment—you gain a partner committed to advancing your business through unmatched product stewardship.
Ready to secure a stable, high-quality potassium sulfate supply? Request a quotation today and let our specialists craft a solution tailored to your exact specifications.
In international chemical procurement, few naming ambiguities cause as much confusion as the phrase aluminium potassium sulfate. Enter this term into a search engine and you’ll encounter references to alum, potash alum, and sometimes even potassium sulfate (K2SO4) — creating a procurement headache for technical buyers across glass manufacturing, pharmaceuticals, agriculture, and water treatment. For sourcing professionals, mistaking aluminium potassium sulfate (KAl(SO4)2·12H2O) for premium potassium sulfate fertilizer can lead to costly errors in formulation, compliance failure, and supply chain waste. This comprehensive guide clarifies the chemical identities, solubility profiles, and distinct industrial roles of these two sulfates. It then focuses on why pure potassium sulfate from a reputable supplier like Hailei Chemical’s premium potassium sulfate (SOP) remains a strategic choice for high-value crop nutrition, glass fluxing, and aluminum recycling.
At the molecular level, aluminium potassium sulfate and potassium sulfate share little more than the sulfate anion. Understanding their structures immediately clarifies why one is an indispensable fertilizer and the other a workhorse in municipal water treatment.
This double sulfate of aluminum and potassium has been known for centuries. Its application spectrum extends from leather tanning to food-grade baking powder, but its defining industrial role lies in flocculation — the process of clarifying water by aggregating colloidal particles.
Unlike alum, potassium sulfate contains no aluminum and no water of crystallization. Its primary value is as a chlorine-free potassium source for premium agriculture and as a high-purity additive in demanding industrial processes. Hailei Chemical guarantees a minimum 50% K2O assay, low moisture, and consistent particle size distribution to meet the specifications of formulation-sensitive industries.
When evaluating a salt for industrial use, solubility behavior is among the first technical parameters examined. The search query “is potassium sulfate soluble” and “why is potassium sulfate soluble in water” reflects the practical needs of formulators who must predict dissolution rates, mixing compatibility, and storage stability.
Potassium sulfate is highly soluble in water, though not as hygroscopic as potassium chloride. At 20°C, approximately 111 g of K2SO4 dissolves per liter of water; solubility rises to about 120 g/L at 25°C and reaches 241 g/L at 100°C. This moderate solubility profile makes it ideal for controlled nutrient release in fertigation systems and for preparing stock solutions in glass or pharmaceutical manufacturing.
The solubility of potassium sulfate in water arises from the ionic nature of the compound and the high dielectric constant of water. When K2SO4 crystals contact water, polar water molecules hydrate the K+ and SO42− ions, overcoming the lattice enthalpy of the crystal. The resulting exothermic hydration energy is sufficient to break the ionic bonds, leading to dissolution. The absence of insoluble hydrolysis products (unlike some aluminum salts) means the solution remains clear and stable, a prerequisite for drip irrigation and pharmaceutical excipient use.
Potash alum also dissolves readily — roughly 140 g/L at 20°C — but its aqueous solution is acidic (pH ~3) due to partial hydrolysis of the aluminum ion. This acidity has both benefits (water treatment flocculation) and drawbacks (corrosivity to certain metals, incompatibility with some packaging materials). For buyers who require a neutral, non-acidic potassium salt, potassium sulfate is the unambiguous choice.
To fully appreciate why aluminium potassium sulfate generates such high search volume, one must understand its remarkably broad utility. Procurement teams sourcing for water treatment, food processing, or textile manufacturing often encounter this chemical under various trade names.
The most significant industrial use of alum is as a coagulant in drinking water purification and effluent treatment. When added to turbid water, hydrated aluminum species neutralize the negative charges on suspended particles, forming flocs that settle out. Municipalities globally consume vast tonnages; specification typically calls for Al2O3 content of 15–17% in commercial liquid alum, though potash alum powder is often preferred for small-scale plants due to easier handling.
Food-grade potassium alum (E522) acts as a firming agent for pickled vegetables, a leavening acid in baking powders, and a component of toothpaste. Pharmaceutical applications include astringent styptic pencils and adjuvant in vaccines. In all these uses, strict heavy-metal limits apply, mirroring the purity requirements that Hailei Chemical meets for its potassium sulfate customers in pharma production.
Alum tawing is an ancient technique that produces a white, soft leather used in glove making. In modern dyehouses, alum serves as a mordant, fixing natural dyes to wool and silk fibers. While synthetic alternatives exist, the low cost and predictable performance of potash alum sustain its niche.
From fire extinguisher compounds to paper sizing and fireproofing textiles, aluminium potassium sulfate retains a fragmented but essential presence. However, none of these uses overlap with the core functions of potassium sulfate — a point buyers must reinforce when issuing RFQs to avoid cross-shipments.
Shifting focus to the product that Hailei Chemical manufactures and exports at scale, the following sections detail the primary and secondary markets that depend on high-purity K2SO4.
The dominant market for potassium sulfate is agriculture. Many high-value crops — tobacco, citrus, grapes, potatoes, berries, and certain vegetables — are sensitive to chloride ions. Potassium chloride (MOP), while cheaper, introduces chloride that can reduce crop quality, burn leaves, and degrade soil structure over time. SOP’s chloride content is typically below 1.0%, making it the only safe potassium source for fertigation of such crops. Hailei Chemical’s granular SOP dissolves quickly in water, does not clog drip emitters, and supplies both potassium (50% K2O min.) and sulfur (18% S), a secondary macronutrient essential for protein synthesis and oil formation in seeds.
In specialty glass — particularly high-clarity container glass, television glass, and optical glass — potassium sulfate functions as a fining agent and stabilizer. It reduces the melting temperature of the batch, promotes bubble removal, and improves the refractive index. Glassmakers require a product with extremely low iron and heavy metals, consistent particle size (typically 200–325 mesh), and no caking. Hailei Chemical can tailor its SOP to meet these rigorous frits specifications, often supplying material that surpasses Chinese GB/T 20406-2017 standards.
In secondary aluminum production, a mixture of potassium sulfate and other halide salts forms a protective molten cover flux that prevents oxidation of the aluminum melt and absorbs inclusions. The sulfate component reacts with magnesium to form MgSO4, improving the cleanliness of the recovered metal. Recyclers value SOP with low sodium content and consistent reactivity. As aluminum recycling capacity expands in Europe and North America, the demand for premium potassium sulfate flux is rising steadily — creating a procurement opportunity for specialist importers.
Potassium sulfate appears in oral rehydration solutions, certain tablet formulations as a non-reactive filler, and as a buffering agent. The pharmaceutical industry mandates compliance with pharmacopoeial monographs (USP, EP, BP) that set limits on heavy metals, arsenic, and loss on drying. Hailei Chemical’s dedicated pharma-grade production line ensures batch-to-batch consistency and full documentation support.
In the construction sector, potassium sulfate accelerates the setting time of gypsum plaster and improves the mechanical strength of wallboard. The sulfate ion participates in the hydration reaction of hemihydrate to dihydrate, speeding up production line speeds. Wallboard manufacturers prefer a fine powder (typically < 100 µm) with minimal free moisture.
Given the phonetic similarity between “alum” and “SOP,” procurement errors occur more often than suppliers admit. To ensure you receive aluminium potassium sulfate when you actually need potassium sulfate — or vice versa — implement the following verification steps before issuing a purchase order.
Weifang Hailei Fine Chemical Co., Ltd. operates a modern SOP crystallization facility with an annual capacity exceeding 50,000 metric tons. Our production advantages translate directly into procurement benefits:
For buyers who have previously experienced shipment rejections due to mislabeled chemical identity, Hailei Chemical offers a transparent, test-based supply partnership. View detailed product specifications and packaging options on our potassium sulfate product page.
No. Potassium sulfate does not hydrolyze to form aluminum hydroxide flocs and therefore has no coagulation capacity. Conversely, potash alum cannot replace SOP as a chlorine-free potassium fertilizer because its aluminum content is phytotoxic at agronomic rates.
Yes. With a solubility of approximately 120 g/L at 25°C, potassium sulfate dissolves quickly and does not leave residues in irrigation lines when proper filtration is used. The neutral pH of the solution also prevents corrosion of metallic drip components, unlike acidic alum solutions.
SOP production requires more complex processing — either from natural ores like langbeinite via flotation or through the Mannheim process using sulfuric acid — whereas MOP is mined and refined more directly from sylvinite. The premium cost of SOP is justified by its chlorine-free composition, which preserves yield and quality in high-value crops that cannot tolerate chloride.
Weifang Hailei Fine Chemical Co., Ltd. specializes in potassium sulfate and related inorganic chemicals. While we do not produce potash alum, our technical team can recommend trusted sources if your requirement spans both products. For potassium sulfate inquiries, we invite you to contact us directly.
Whether you formulate specialty NPK blends for a fertilizer distributor, melt high-clarity glass, or produce aluminum deoxidation fluxes, the chemical identity of your raw material is non-negotiable. By understanding the clear boundary between aluminium potassium sulfate and genuine potassium sulfate, procurement professionals eliminate a major source of supply chain risk. Hailei Chemical stands ready to deliver consistent, high-purity SOP with the documentation and logistics support international buyers demand.
Request a competitive quote for granular or powder potassium sulfate, discuss your specification with our technical team, or arrange a representative sample shipment. Visit Get a Quote to start the conversation — our export desk responds within 24 hours.
For specialty fertilizer importers and distributors, selecting the right potassium source can make the difference between a thriving supply chain and costly crop damage. Among the most sought-after grades is 0-0-50 potassium sulfate—a premium, chlorine-free formula known in the industry as sulfate of potash (SOP). With a guaranteed minimum of 50% K2O, this high-purity fertilizer is indispensable for growers of chlorine-sensitive crops like tobacco, potatoes, grapes, tree nuts, and citrus. In this comprehensive guide, we unpack everything a professional buyer needs to know about 0-0-50 SOP: from deciphering quality parameters and comparing suppliers, to navigating logistics and verifying authenticity. If you’re building a reliable import program for potassium sulfate, this article will equip you with actionable insights you won’t find on a typical product data sheet.
The number sequence “0-0-50” is a fertilizer grade expressed in the standard N-P-K format, indicating the percentage by weight of nitrogen (N), phosphorus pentoxide (P2O5), and water-soluble potassium oxide (K2O). A 0-0-50 grade means the material contains no intentionally added nitrogen or phosphorus, and a guaranteed minimum of 50% K2O. In the case of potassium sulfate, the remaining mass consists of sulfate (SO42-) and minor impurities. This high concentration of potassium oxide makes 0-0-50 SOP one of the most efficient potassium carriers available, rivaled only by potassium chloride (MOP) which typically carries 60% K2O. However, the critical distinction lies in the accompanying anion: chloride versus sulfate. The “0” in nitrogen and phosphorus makes 0-0-50 potassium sulfate a straight potassium fertilizer, ideal for blending into compound NPK formulations or for direct application where only potassium and sulfur are required.
Many high-value crops—including tobacco, potatoes, berries, grapes, almonds, and citrus—are highly sensitive to chloride ions. Excess chloride can reduce crop quality, cause leaf scorching, interfere with water uptake, and lower marketable yields. Therefore, using potassium chloride (MOP) on these crops can be disastrous. That’s where 0-0-50 potassium sulfate comes in. By delivering potassium in a sulfate rather than chloride form, SOP eliminates the risk of chloride toxicity. Additionally, the sulfur component (typically around 17–18% S) is a secondary macronutrient essential for protein synthesis and enzyme function. Crops grown in sulfur-deficient soils show marked improvement when SOP is applied, making the 0-0-50 grade a dual-nutrient solution. For fertilizer importers servicing growers of high-value horticultural crops, offering a reliable source of 0-0-50 SOP not only meets a critical market demand but also builds long-term customer loyalty.
Not all SOP labeled “0-0-50” is equal. As a professional buyer, you must scrutinize the full product specification, not just the K2O content. Below are the essential parameters you should verify on every certificate of analysis (COA) when purchasing 0-0-50 potassium sulfate from any supplier.
The industry benchmark for premium SOP is a minimum of 50% K2O. Some lower-grade materials might assay at 48–49%, which can affect blend uniformity and application rate calculations. Always request a COA that clearly states the exact percentage. At Hailei Chemical, our 0-0-50 potassium sulfate consistently tests at ≥50.5% K2O, giving importers confidence in every shipment.
The whole point of choosing SOP over MOP is to avoid chloride. A top-quality 0-0-50 SOP should have a maximum chloride content of ≤1.0%, and preferably ≤0.5%. The Mannheim process (commonly used in China) can yield chloride levels as low as 0.3% if raw materials and process controls are tightly managed. Insist on a chloride guarantee in your supply contract.
Excess moisture leads to caking, handling difficulties, and nutrient dilution. Acceptable moisture is typically ≤1.0%. Powders may require lower moisture to maintain free-flowing properties; granular SOP can tolerate slightly higher moisture but still should not exceed 1.5%.
0-0-50 potassium sulfate is available in powder, granular, and sometimes crystalline forms. Granular SOP (2–4 mm) is preferred for bulk blending because it resists segregation and is easier to spread mechanically. Powdered SOP (<0.5 mm) is often used in water-soluble fertilizer and foliar applications. Clarify your target market’s usage patterns and specify the appropriate mesh size.
SOP has a solubility of about 110 g/L at 20°C, lower than MOP but still adequate for fertigation and foliar feeding. Finely ground powder dissolves faster. High-purity SOP should leave minimal insoluble residue. Insist on a water-insoluble limit of ≤0.1% for specialty applications.
In pharmaceutical or glass-grade applications, trace heavy metals such as lead, arsenic, and cadmium must be strictly controlled. Even for agricultural use, European and Japanese buyers often demand heavy metal certifications. Hailei Chemical offers pharmaceutical-grade potassium sulfate with heavy metals in compliance with EP/USP standards.
Good SOP has a near-neutral pH (typically 6–8 in a 5% solution). Excess free sulfuric acid can cause packaging corrosion and handling hazards. The specification should include a maximum free acid (as H2SO4) of ≤0.5%.
China is the world’s largest producer and exporter of potassium sulfate, supplying well over half of the global demand. With numerous factories in Shandong, Qinghai, and Xinjiang, importers have plenty of options—but also face quality variability, logistical complexities, and language barriers. Here is a practical framework for vetting Chinese suppliers of 0-0-50 potassium sulfate.
The Mannheim process (reacting potassium chloride with sulfuric acid in a high-temperature furnace) is the dominant method for producing SOP in China. It yields a material with K2O ≥50% and low chloride. Some producers also extract SOP from natural salt lake brines in Qinghai, which can offer a lower carbon footprint but may have slightly different crystal habits. When sourcing, ask for the production method; Mannheim-process SOP is generally more consistent in quality and particle morphology.
Request the following from any prospective supplier:
Never rely solely on a supplier’s own COA. Arrange for a pre-shipment inspection (PSI) by an independent agency, and have samples drawn according to international standards (e.g., ISO 3963 for fertilizer sampling). Test for all parameters above, and if possible, seal a retain sample for future reference.
Your purchase contract should clearly state the quality specification as a guarantee, not merely a “typical analysis.” Include allowance for rejection if K2O falls below 49.5% or chloride exceeds 1.5%, for example. Also specify the method of analysis (e.g., AOAC, EN, or GB standard).
At Hailei Chemical’s potassium sulfate production line, we manufacture 0-0-50 SOP using the state-of-the-art Mannheim process with strict quality controls. Our annual capacity of 80,000 metric tonnes allows us to serve fertilizer distributors, glass manufacturers, and pharmaceutical companies across more than 40 countries. Each batch is tested for at least the following:
We provide full technical documentation, a mill certificate with every lot, and support third-party inspection at our factory in Shandong or at the port of loading. Many of our long-term clients rely on our consistent 0-0-50 potassium sulfate to feed blending plants across Southeast Asia, Latin America, and Africa. Explore the full product specifications and request a sample.
Transporting 0-0-50 SOP from China to your destination port involves careful planning. The material is non-hazardous and does not require special transport classification, but its hygroscopic nature demands moisture-proof packaging. Standard packaging options include 25 kg PE-lined woven bags, 50 kg bags, or 1000–1250 kg jumbo bags. For buyers with bulk handling facilities, we can also supply in 20’ or 40’ bulk containers using liner bags. A 20-foot container can hold approximately 25–27 metric tonnes in bags, or 22–24 tonnes in bulk bags. Lead times from Shandong ports are typically 15–25 days to major Asian ports, 30–35 days to Europe, and 40–50 days to South America. Always factor in ocean freight volatility and insurance. Hailei’s logistics team can arrange FOB, CIF, or CFR terms with trusted carriers to ensure on-time delivery.
While your customers are the end users, understanding typical application rates helps you position 0-0-50 potassium sulfate effectively. For field crops like potatoes, SOP is applied at 150–300 kg/ha, supplying 75–150 kg K2O/ha plus 25–50 kg S/ha. For drip-irrigated vegetables, a water-soluble powder form is injected at 20–50 ppm K. For tree crops, annual application rates of 1–2 kg per tree are used. Given the typical price premium of SOP over MOP (often 30–50% higher per unit of K2O), importers can command higher margins in specialized markets. By demonstrating the tangible yield and quality benefits to growers, you can build a value-added distribution business around premium SOP.
| Parameter | 0-0-50 Potassium Sulfate (SOP) | 0-0-60 Potassium Chloride (MOP) |
|---|---|---|
| K2O content | ≥50% | ≥60% |
| Chloride | ≤1.0% (typically <0.5%) | ~47% Cl |
| Sulfur (S) | ~17-18% | 0% |
| Solubility (g/L at 20°C) | ~110 | ~340 |
| pH effect | Neutral to slightly acidic | Neutral |
| Main use | High-value, Cl-sensitive crops | Field crops tolerant to Cl |
| Cost per unit K2O | Higher | Lower |
Importers should note that while SOP is more expensive, its ability to access specialty crop segments and command premium pricing often yields better net profitability than competing on price with MOP. Furthermore, as global demand for nutritious and high-value foods rises, the SOP market is projected to grow at 4–5% CAGR, outpacing MOP.
Yes, granular SOP is fully compatible with most granular N and P fertilizers in bulk blends. Its density matches well, minimizing segregation. However, avoid blending with calcium nitrate unless used immediately, as calcium sulfate may precipitate over time.
No. Potassium sulfide (K2S) is an entirely different chemical compound used in leather processing and pyrotechnics. It is not suitable as a fertilizer and can be dangerous if mishandled. When importing, always verify you are buying potassium sulfate (K2SO4), not potassium sulfide.
The molecular weight of K2SO4 is 174.26 g/mol. While this is a fundamental chemical property, the more important metric for fertilizer buyers is the K2O equivalent—potassium sulfate has a theoretical K2O content of 54%, though commercial grades are typically 50% due to manufacturing processes.
Aluminium potassium sulfate (potassium alum) is a double salt used in water treatment, baking powder, and cosmetics. It is not directly interchangeable with 0-0-50 potassium sulfate fertilizer, though potassium sulfate itself is used as a pharmaceutical excipient and in glass manufacturing. If you are sourcing for those non-fertilizer applications, check the relevant powder specifications; we also supply high-purity grades for these industries.
Selecting the right 0-0-50 potassium sulfate supplier is a decision that impacts your entire fertilizer product line. With consistent assay, low chloride, and industry-recognized quality, Hailei Chemical is ready to be your long-term partner. Whether you need a full container of granular SOP for blending or a multi-container shipment of pharmaceutical-grade powder, we have the production capacity and export experience to meet your demands.
Visit our 0-0-50 Potassium Sulfate product page to download the latest specification sheet and MSDS, or request a competitive quote today. Our sales team will respond within 24 hours with a tailored offer, including current FOB/CIF prices, packaging options, and lead times. Don’t settle for uncertain quality—choose Hailei Chemical as your trusted source for potassium sulfate.
For procurement managers and agronomists asking where to buy potassium sulfate fertilizer that consistently meets purity, solubility, and chlorine-free standards, the answer lies in partnering with a manufacturer that combines technical expertise with global logistics. Potassium sulfate (K2SO4), also known as sulfate of potash (SOP), is the preferred potassium source for high-value, chloride-sensitive crops and numerous industrial processes. This comprehensive guide examines every facet you need to evaluate before committing to a bulk purchase—from chemical specifications and regional production hubs to price determinants and quality verification protocols.
With decades of fine chemical manufacturing experience, Weifang Hailei Fine Chemical Co., Ltd. delivers potassium sulfate that exceeds industry benchmarks for agriculture, glass, aluminum recycling, and pharmaceuticals. Whether you import container loads for fertilizer blending or require technical-grade K2SO4 for specialized manufacturing, understanding the nuances of the global SOP market is essential to securing a reliable, cost-effective supply.
Potassium sulfate is an inorganic salt with the formula K2SO4, appearing as a white, crystalline powder or granular solid. Unlike the more common potassium chloride (MOP), it contains virtually no chloride, making it indispensable for crops like tobacco, potatoes, citrus, grapes, and berries where chloride toxicity can ruin yield and quality. In industrial settings, its high melting point (1069°C) and fluxing properties enable applications from glass refining to aluminum salt bath treatments.
Agricultural-grade potassium sulfate typically guarantees a minimum K2O content of 50%, with premium sources reaching 51–52%. The chloride content must remain below 0.5% by weight, and many buyers demand even tighter specifications of ≤0.2% Cl. Hailei Fine Chemical’s standard product meets K2O ≥ 50.5%, Cl ≤ 0.2%, with moisture under 0.5%. These figures align with ISO 17318:2015 for SOP fertilizers and ensure maximum nutrient uptake without soil salinization.
Buyers choose between granular, powder, and water-soluble crystal forms depending on application. Granular potassium sulfate (2–4 mm) is ideal for bulk blending and broadcast spreading. Fine powder (100–325 mesh) is preferred for fertigation concentrates, foliar sprays, and industrial formulations. Water-soluble SOP with dissolution rates above 99% in 5 minutes supports hydroponic and drip irrigation systems. Confirm your supplier’s ability to customize particle size distribution and provide sieve analysis certificates.
Global SOP demand is driven by the shift toward precision agriculture and high-value horticulture. Chloride-induced stress can reduce photosynthesis, burn leaf margins, and depress fruit set. When farmers apply SOP, they gain multiple agronomic benefits without the risks associated with muriate of potash.
These agronomic advantages translate directly into procurement specifications: any supplier claiming to meet the “chlorine-free” label must provide third-party lab analysis and maintain batch consistency throughout the season.
SOP production is concentrated in regions with accessible potassium-bearing minerals or established Mannheim process infrastructure. Major exporters include Germany, Belgium, China, Egypt, and the United States. China has expanded its capacity significantly, positioning itself as a flexible, cost-competitive source for international buyers. When evaluating where to buy potassium sulfate fertilizer, consider these sourcing dimensions:
When you narrow down potential sources, a structured supplier audit reduces risk. Request the following documentation and verify claims independently:
Hailei Fine Chemical routinely provides pre-shipment COAs verified by independent surveyors, giving buyers confidence in every FCL or break-bulk shipment.
The market price potassium sulfate fluctuates based on input costs, energy, freight, and seasonal agricultural demand. A typical FOB China price for granular SOP (K2O 50%) can range between $500 and $700 per metric ton, though tight potassium chloride feedstock and sulfuric acid costs can push it higher. Buyers can achieve better pricing through long-term contracts, volume commitment, and flexible delivery scheduling.
Instead of simply comparing unit prices, evaluate total landed cost including import duties, port handling, and inland delivery. Request price breakdowns, force majeure clauses, and quality adjustment terms. A supplier that offers price lock-in for 3–6 months can stabilize your production budget. At Hailei, we work with importers to structure flexible payment terms and volume discounts—contact our sales team for a tailored offer based on your annual off-take.
While agriculture dominates SOP consumption, industrial applications create substantial niche demand. Understanding these uses helps multi-sector buyers identify a single supplier capable of meeting diverse technical specifications.
Potassium sulfate serves as a fining agent and flux in specialty glass, including optical lenses, television screens, and solar panel glass. It lowers melting temperature, removes bubbles, and improves refractive index uniformity. High-purity K2SO4 with minimal iron (<50 ppm) and other colorant metals is non-negotiable for clear glass. Particle size consistency ensures homogeneous melting kinetics.
In secondary aluminum smelting, potassium sulfate is a component of salt flux blends designed to protect molten metal from oxidation, strip impurities, and coalesce aluminum droplets. This application requires close control over carbonate and chloride traces to prevent gas defects in final alloy. A frequently asked question—“what is potassium aluminum sulfate used for”—often arises because of nomenclature overlap. Potassium aluminum sulfate, or alum, has the formula KAl(SO4)2·12H2O and is applied in water treatment, paper sizing, and food pickling. It is entirely different from potassium sulfate (K2SO4). In aluminum recycling, the sulfate ion of K2SO4 helps form a protective molten salt cover, while the potassium contributes to flux fluidity; no aluminum is present in the chemical itself. Ensuring you order the correct compound prevents costly formulation errors. If you need aluminium potassium sulfate formula confirmation, remember that alum is KAl(SO4)2·12H2O, whereas technical SOP remains simply K2SO4.
Potassium sulfate is listed in pharmacopoeias (Ph. Eur., USP-NF) as an excipient used to adjust osmotic pressure and as a tableting filler. While consumers often search “what does taking potassium benefit,” referencing potassium’s role in nerve transmission and muscle contraction, they are usually referring to potassium chloride or citrate supplements. In pharmaceutical manufacturing, K2SO4’s low toxicity and inertness make it suitable for tablet blends, dialysis solutions, and veterinary infusion fluids. Hailei’s pharma-grade SOP meets endotoxin and microbial limits with a purity exceeding 99% on a dry basis.
A thorough pre-shipment inspection program is the bedrock of trust in international chemical trade. From sampling to loading, buyers should insist on transparent protocols that align with GAFTA, FOSFA, or ISO 2859 standards.
Moisture ingress during sea transit can cake powder and promote microbial growth. Specify PE inner liners, desiccant bags, and sealed containers. For bulk vessel shipments, ensure watertight hatches and hold cleanliness. Hailei’s export team coordinates with SGS-certified surveyors to witness sampling, verify packaging strength, and issue a clean report of findings before vessel departure.
A large European fertilizer distributor had suffered repeated complaints from berry growers due to leaf scorch traced to chloride levels exceeding 1% in their previous SOP source. After auditing three Chinese manufacturers, they selected Hailei based on our demonstrable Cl ≤ 0.2% consistency across 20 consecutive batches. Through direct FCL shipments with on-board COAs, the importer reduced quality claims to zero within one season, strengthening their retailer relationships and gaining exclusive regional distribution rights for Hailei’s premium SOP. This success underlines why rigorous supplier qualification directly impacts downstream profitability.
When you decide where to buy potassium sulfate fertilizer, choose a partner that views your success as its own. Weifang Hailei Fine Chemical Co., Ltd. brings together advanced Mannheim production lines, ISO-certified quality management, and a customer-centric export department. Our standard potassium sulfate (K2O ≥ 50.5%, Cl ≤ 0.2%) is available in granular, powder, and soluble forms, and we can tailor particle size, packaging, and documentation to your market requirements.
Don’t settle for suppliers that compromise on purity or transparency. Explore our potassium sulfate product page for detailed specifications and technical data. Ready to secure a competitive quote? Submit your inquiry now and a dedicated account manager will respond with pricing, MOQ, and delivery options within one business day.
When sourcing specialty chemicals for industrial applications—whether for water treatment, glass production, or high-value agriculture—the Material Safety Data Sheet (MSDS) is not just a formality. For procurement managers and chemical engineers, the potassium aluminum sulfate MSDS serves as the foundational document that ensures regulatory compliance, workplace safety, and product consistency. At Hailei Chemical, we understand that navigating technical documentation across international supply chains can be challenging. This guide breaks down exactly what a potassium aluminum sulfate MSDS should contain, how it differs from related documents for potassium sulfate, and what buyers should look for when evaluating the true cost and safety of chlorine-free potassium salts.
Potassium aluminum sulfate—commonly known as alum or potash alum—is an inorganic double salt with the formula KAl(SO₄)₂·12H₂O. It is widely used as a flocculant in water purification, a mordant in textile dyeing, a leavening agent in baking powder, and a component in fire extinguishers. In many industrial contexts, it serves as an alternative or complement to the chlorine-free potassium fertilizers that Hailei Chemical exports globally. While potassium aluminum sulfate and potassium sulfate (sulfate of potash, the potassium sulfate common name) share the sulfate anion, their cation composition makes them suitable for very different end uses. Potassium sulfate (K₂SO₄) with a minimum K₂O of 50% is primarily a premium fertilizer for chloride-sensitive crops like tobacco, grapes, and citrus. In contrast, aluminum-based alum is rarely used in agronomy due to its aluminum content, which can be phytotoxic. Instead, it finds its niche in municipal and industrial water treatment, papermaking, and pharmaceutical manufacturing.
Buyers seeking a chlorine-free potassium salt for fertilizer blending will naturally encounter the price of potassium sulfate fertilizer alongside quotes for alum. However, the two products are not interchangeable. Understanding the distinct chemical properties, safety requirements, and market pricing is critical for making a cost-effective and compliant sourcing decision. This is where the MSDS becomes the universal passport for international chemical shipments.
An MSDS—now more commonly referred to as a Safety Data Sheet (SDS) under the Globally Harmonized System (GHS)—is a 16-section document that communicates the hazards, handling procedures, and emergency control measures for a chemical substance. For importers and bulk purchasers, the potassium aluminum sulfate MSDS offers several layers of assurance:
When you request a quote for price potassium aluminum sulfate, always ask for a current MSDS alongside the commercial invoice. Reputable suppliers like Hailei Chemical provide SDSs that are updated in accordance with the latest GHS revision, verified by third-party laboratories, and available in multiple languages. This proactive approach minimizes supply chain disruptions and protects your company from liability.
A thorough supplier evaluation goes beyond a cursory glance at the document. Here are the critical sections of a potassium aluminum sulfate MSDS that demand careful review:
Potassium aluminum sulfate is generally classified as a mild irritant. The GHS hazard statements typically include H315 (Causes skin irritation) and H319 (Causes serious eye irritation). For granular or powdered forms, the dust may also carry an H335 (May cause respiratory irritation). Compare these classifications with your existing workplace risk assessments. If you handle large volumes in enclosed spaces, ensure the supplier includes appropriate engineering control recommendations in Section 8.
This section must list potassium aluminum sulfate dodecahydrate as the primary component, often with a purity range (e.g., ≥99.5% on a dry basis). Trace impurities such as iron or heavy metals should be disclosed. For pharmaceutical-grade alum used as an excipient, purity specifications are far tighter—typically meeting USP, EP, or BP monographs. If your application demands high purity, cross-reference this section with the certificate of analysis (COA).
Key parameters include appearance (white crystals or powder), pH (typically 3.0–4.0 for a 10% aqueous solution), melting point, and bulk density. For international logistics, the bulk density is essential for calculating container loading volumes. At Hailei Chemical, we optimize packing—whether in 25 kg bags, 1000 kg supersacks, or bulk—based on these exact physical properties to maximize freight efficiency.
Potassium aluminum sulfate is not classified as a dangerous good under ADR, IMDG, or IATA regulations for most forms. However, certain hydrated forms or mixtures may require environmental hazard labeling (UN 3077) if they contain ecotoxic impurities. A correctly prepared MSDS will state “Not regulated” or provide the appropriate UN number. This directly influences your freight cost and documentation requirements. Always confirm this section matches your logistics provider’s expectations.
For buyers considering both alum and sulfate of potash, a side-by-side comparison clarifies which product fits their operational needs. While the price of potassium sulfate fertilizer is often benchmarked against global MOP (muriate of potash) indices, chlorine-free SOP (sulfate of potash) commands a premium due to its specialized production process and controlled solubility. In contrast, the price potassium aluminum sulfate is more closely tied to aluminum hydroxide and sulfuric acid markets, as well as regional demand for water treatment coagulants.
From a safety documentation standpoint, the MSDS for potassium sulfate (K₂SO₄) is notably simpler: it is non-hazardous, non-flammable, and does not require extensive hazard statements. That makes it a low-regulatory-burden product ideal for bulk agricultural distribution. However, the absence of hazard does not eliminate the need for an MSDS; it simply means the document focuses on safe handling practices, spill containment, and ecological information. At Hailei Chemical, we supply both potassium sulfate for premium fertilizer applications and can advise on alum sourcing through our network, ensuring all documentation—including the potassium aluminum sulfate MSDS—meets the strictest international standards.
A common procurement mistake is evaluating chemical pricing purely on a per-metric-ton basis without factoring in the total cost of ownership (TCO) implied by the MSDS. For example, a low price potassium aluminum sulfate might come from a supplier whose MSDS reveals a higher moisture content or a lower purity that will increase your formulation costs. Similarly, if the MSDS indicates the product is classified as a marine pollutant, you may incur higher freight and insurance charges that erode any apparent savings.
When you inquire about the price of potassium sulfate fertilizer, always request the corresponding SDS for the exact grade being offered—water-soluble powder, granular, or technical grade. At Hailei Chemical, our quotations include a link to the current MSDS for that specific lot, so you can verify compliance before committing to a purchase order. This transparency reduces risk and builds long-term supply chain resilience.
Whether you are importing alum for a municipal water plant or SOP for a vineyard, apply this ten-point checklist to every supplier evaluation:
As a leading Chinese exporter of potassium sulfate and a partner for chlorine-free chemical solutions, we recognize that the potassium aluminum sulfate MSDS is more than a regulatory artifact—it is a trust-building tool. Our in-house quality team continuously monitors GHS revisions across our target markets in Southeast Asia, Latin America, and the Middle East, ensuring that every safety data sheet we provide is not only accurate but also culturally and linguistically appropriate. For customers sourcing our high-purity potassium sulfate (K₂O ≥50%), this means receiving an SDS that seamlessly integrates with their local hazard communication programs, accelerating product registration and market entry.
Moreover, we offer technical support to help procurement teams interpret MSDS data and map it against their specific industrial application—be it glass manufacturing, aluminum recycling, or pharmaceutical excipient production. By choosing a supplier that values comprehensive documentation, you reduce the risk of costly non-compliance issues and position your supply chain for sustainable growth.
Whether you need potassium sulfate for chloride-sensitive crops or require guidance on chlorine-free alternatives like potassium aluminum sulfate, Hailei Chemical delivers both product quality and documentation integrity. Contact our team today to request a current potassium aluminum sulfate MSDS, a detailed specification sheet for our potassium sulfate, or a competitive price quotation tailored to your annual volume and destination port. Visit our quote request page or reach out through our regional representatives to start a partnership built on safety and reliability.
For procurement managers and chemical engineers sourcing potassium sulfate (K2SO4), understanding the benefits of potassium is only the first step. The real challenge lies in identifying a supplier that delivers premium-grade material meeting exact specifications—whether for chloride-sensitive crops, pharmaceutical preparations, or flat glass manufacturing. This comprehensive guide examines the critical quality parameters, solubility behavior, and industrial applications of potassium sulfate, and provides a structured framework to evaluate suppliers, ensuring your supply chain delivers consistent value.
Potassium sulfate, often called sulfate of potash (SOP), is a white crystalline powder or granular material prized for its low chloride content and high nutrient density. As a leading Chinese chemical exporter, Weifang Hailei Fine Chemical Co., Ltd. produces K2SO4 that meets rigorous international standards. But before you place an order, you need to know what separates a reliable supplier from a costly risk. Read on to learn the specifications, avoid common confusion with alum, and make informed procurement decisions.
Potassium is one of the three primary macronutrients for plants, alongside nitrogen and phosphorus. In agriculture, the benefits of potassium include enhanced drought resistance, improved stalk strength, increased fruit size and quality, and better nitrogen utilization. Unlike potassium chloride (MOP), the sulfate form adds no harmful chlorides, making it ideal for tobacco, potatoes, citrus, grapes, and many other high-value crops. But potassium’s industrial benefits extend far beyond farming.
In glass manufacturing, potassium oxide (K2O) derived from potassium sulfate acts as a powerful flux, lowering the melting temperature of silica and reducing energy consumption. The resulting glass exhibits superior clarity, thermal shock resistance, and workability—qualities essential for flat glass, optical lenses, and specialty containers. For aluminum recyclers, potassium sulfate is a key component of salt flux formulations that separate molten aluminum from oxide dross, improving metal recovery rates by up to 5%. In the pharmaceutical sector, high-purity K2SO4 serves as an excipient and an active ingredient in osmotic laxative preparations. Even gypsum board producers incorporate potassium sulfate to enhance fire resistance and mechanical bonding. Recognizing these diverse uses underscores why buyers must demand stringent quality—every application depends on consistent composition.
When evaluating bulk potassium sulfate shipments, specification sheets reveal the true value. Here are the parameters every industrial buyer should scrutinize:
By aligning these specs with your end-use, you can compare quotations on an equal footing and avoid “cheap” suppliers who compromise on hidden parameters.
Potassium sulfate solubility in water is a key physical property that directly impacts manufacturing and formulation. At 25°C, K2SO4 dissolves to about 120 grams per liter; at 100°C, solubility rises to roughly 240 g/L. This moderate solubility is intentionally designed for controlled nutrient release in fertigation systems and for creating stable solutions in industrial batches.
For liquid fertilizer producers, achieving a concentrated SOP stock solution requires warm water (40–50°C) and continuous agitation. In contrast, potassium chloride dissolves at much higher concentrations (>340 g/L at 20°C), so substituting K2SO4 without adjusting process parameters can lead to incomplete dissolution and clogged nozzles. Understanding this characteristic helps you design mixing protocols and select the right particle size.
In the pharmaceutical sector, solubility determines the efficacy of products such as sodium sulfate potassium oral solution, a colonic lavage preparation used before colonoscopies. This medication relies on a precise blend of sodium sulfate, potassium sulfate, and magnesium sulfate; the potassium component must dissolve completely to achieve the correct osmotic balance without causing gastrointestinal discomfort. Manufacturers sourcing potassium sulfate for such formulations should request dissolution rate data and ensure a fine, crystal-clear powder with minimal insoluble residue. Even trace impurities can affect solution stability and patient safety.
A practical tip: ask your supplier for a solubility curve or perform a rapid dissolution test upon receipt of pre-shipment samples. A product that leaves excessive sediment or takes too long to dissolve could indicate caking, coarse particle clumps, or foreign matter.
The versatility of sulphate of potash uses extends well beyond commodity fertilizer. Here’s a snapshot of the most demanding applications:
As the global focus shifts to food quality and sustainability, SOP is gaining ground over MOP in fruit orchards, vineyards, greenhouses, and organic-certified programs. Its negligible chloride content prevents leaf burn and toxicity in sensitive crops like avocadoes, berries, and tea. Moreover, sulfate sulfur contributes to protein synthesis and enzyme activation, making SOP a dual-nutrient premium input.
Potassium sulfate introduces potassium oxide into the glass batch, refining the melt and improving viscosity control. This is critical for producing thin display glass, borosilicate items, and specialty lighting. Even small variations in K2O content can alter expansion coefficients, so glassmakers often specify custom blends and tight tolerances.
In secondary aluminum smelters, a salt flux containing potassium sulfate promotes separation of aluminum from magnesium, calcium, and other impurities. The sulfate radical reacts with sodium and magnesium to form slags that are easily skimmed off, raising the yield of pure aluminum. Consistent flux composition is vital; a shift in raw material quality can disrupt the metal recovery process.
Beyond colonoscopy preps (sodium sulfate potassium oral solution), USP-grade potassium sulfate is used as a bulking agent in tablet manufacturing and as a mineral supplement in certain intravenous solutions. Regulatory oversight demands full traceability and a Drug Master File (DMF) from the supplier.
Potassium sulfate modifies the crystal structure of gypsum during hydration, enhancing core strength and fire resistance. This niche but growing application requires a pure, dry powder free from heavy metal contaminants that could affect board performance or workplace safety.
Each use case imposes distinct quality requirements, so a one-size-fits-all product rarely suffices. Work with a supplier who can tailor specifications to your exact process needs.
A frequent source of confusion for importers is the similarity in names between potassium sulfate and anhydrous potassium aluminum sulfate (also called potash alum or aluminum potassium sulfate). While both are white crystalline salts, their chemistry and applications diverge sharply.
Anhydrous potassium aluminum sulfate (CAS 10043-67-1) is a double salt with aluminum and potassium cations combined with sulfate. It’s primarily used in water treatment as a flocculant, in leather tanning, as a mordant in dyeing, and as a leavening agent in baking powder. The aluminum content makes it unsuitable for fertilizer—aluminum is toxic to plant roots at even moderate concentrations, and its presence would ruin a fertilizer’s value proposition. Mixing up these two products can lead to catastrophic crop failures, product liability claims, and regulatory penalties.
Potassium sulfate (CAS 7778-80-5), on the other hand, contains no aluminum and is the go-to chloride-free potassium source. Before issuing a purchase order, confirm the CAS number, request a chemical analysis, and clarify the intended application with your supplier. A reputable supplier like Hailei Chemical will provide clear documentation and never substitute lower-cost alum for SOP.
Moving beyond technical specs, a structured supplier assessment can save you from costly disruptions. Use these seven questions as a checklist when engaging new potassium sulfate sources:
By methodically addressing these questions, you build a supplier profile that mitigates risks and aligns with your long-term sourcing strategy.
Weifang Hailei Fine Chemical Co., Ltd. places transparency, technical expertise, and consistent quality at the core of every transaction. Our Potassium Sulfate is manufactured under stringent process controls, confirming K2O ≥50%, chloride <0.5%, and full water solubility with minimal insolubles. Whether you need granular SOP for bulk blending, fine powder for pharmaceutical formulation, or customized particle distribution for specialty glass, we have the flexibility to serve your requirements.
Our technical team understands the nuances of international logistics—moisture-proof packaging, container fumigation, and document preparation (COA, MSDS, certificate of origin). We support clients throughout the pre-purchase, sampling, and after-delivery phases, ensuring a seamless import experience. With ISO 9001 certification and REACH registration (when applicable), Hailei Chemical is positioned as a reliable partner for buyers in over 30 countries.
When you choose us, you gain more than a chemical shipment—you gain a partner committed to advancing your business through unmatched product stewardship.
Ready to secure a stable, high-quality potassium sulfate supply? Request a quotation today and let our specialists craft a solution tailored to your exact specifications.