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.
For procurement managers and chemical importers, price potassium sulfate is often the first metric on a spreadsheet. Yet, settling for the cheapest per-tonne quote without digging deeper can lead to inconsistent quality, delayed shipments, or product that fails your end customers’ specifications. Potassium sulfate (K2SO4) is not a generic commodity—its value in high-value agriculture, glass manufacturing, aluminum recycling, and pharmaceutical production hinges on purity, particle uniformity, and chlorine-free composition. This guide flips the conversation: rather than simply chasing the lowest price potassium sulfate, we’ll explore how to build a supplier evaluation framework that balances cost, quality, and supply chain reliability. Along the way, we’ll answer common questions like what does potassium sulfate do for your specific application, where to buy potassium sulfate fertilizer with confidence, and even touch on related products like when you might need to buy alum potassium aluminum sulfate. By the end, you’ll be equipped to partner with a manufacturer like Hailei Chemical’s premium potassium sulfate that delivers long-term value, not just a transaction.
Before dissecting price, let’s clarify what does potassium sulfate actually do across its major industrial and agricultural roles. Potassium sulfate is the premium potash source for chloride-sensitive crops such as tobacco, grapes, citrus, potatoes, and many greenhouse vegetables. Unlike potassium chloride (MOP), K2SO4 supplies potassium and sulfur without the chloride that can burn roots or degrade crop quality. For glass manufacturers, it acts as a fining agent, reducing bubbles and improving clarity. In aluminum recycling, high-purity potassium sulfate is used in salt flux formulations to separate impurities from molten metal. The pharmaceutical industry exploits its inert, soluble nature as an excipient and buffering agent in certain drug formulations.
These diverse uses explain why quality specifications are non-negotiable. A minimum 50% K2O content (often 51–52% for top grades) and chloride content below 0.5% are baseline expectations. Even small deviations can render a shipment unusable for a hydroponic nutrient blender or a precision glass furnace. So, when comparing price potassium sulfate, the true cost per unit of effective K2O and the penalty of contaminants must be factored in. In other words, a low sticker price for substandard material is not a bargain.
The price potassium sulfate you see in trader quotes or supplier offers is shaped by multiple intertwined variables. Understanding them helps you benchmark and negotiate effectively.
Two main industrial routes produce K2SO4: the Mannheim process (reacting potassium chloride with sulfuric acid) and extraction from natural brines or langbeinite ores. Mannheim-process sulfate typically offers higher purity and is more energy-intensive, reflecting a higher base price. Natural-source sulfate may be marketed as “organic-compatible” but often requires more extensive purification to reach the same K2O levels. Pharmaceutical or analytical-grade potassium sulfate requires additional recrystallization, raising the price substantially—sometimes 2–3 times the cost of agricultural-grade product. When you request quotes, always specify the grade and minimum purity required; a supplier quoting Mannheim-process material with 51% K2O and 0.1% chloride will naturally be at a different price point than one offering unrefined mineral sulfate.
For fertilizer blenders, a uniform granular or crystalline particle size (often 1–3 mm) reduces segregation during mixing and application. Producing a tightly controlled particle distribution adds processing steps like screening and grinding, which increase cost. On the other hand, standard powder or fine crystals may be cheaper but unsuitable for some mechanical spreaders. Industrial buyers (e.g., glass manufacturers) may prefer fine powder for quick dissolution. Always match particle size specifications to your process to avoid paying for unnecessary refinement or experiencing functional failures.
Bulk shipments in 1-ton FIBC bags or loose in containers usually yield the lowest per-unit freight cost, while 25 kg bags or smaller packaging add handling charges. Ocean freight rates, port congestion, and inland transportation all contribute to the final landed price potassium sulfate. Chinese exporters like Hailei Chemical can leverage efficient port networks (Qingdao, Shanghai) to minimize logistics surcharges, but buyers must consider these components in the total cost of ownership.
Agriculture drives seasonal spikes—pre-planting spring demand in the Northern Hemisphere or counter-season demand from Latin America and Australia can tighten supply temporarily. Energy prices (coal, natural gas, electricity) directly impact Mannheim process costs. Currency exchange shifts between the US dollar and RMB also affect international pricing. A transparent supplier will help you navigate seasonal trends rather than exploit them.
Whether you need to where to buy potassium sulfate fertilizer for a multi-container import or a steady industrial supply, a systematic assessment of potential suppliers protects your operation. Use this checklist before committing to an order.
By weighing these factors alongside price potassium sulfate, you build a scorecard that prevents costly procurement mistakes. Hailei Chemical’s potassium sulfate product page transparently lists specifications and offers a straightforward inquiry process, giving you a concrete baseline for comparison.
When you search where to buy potassium sulfate fertilizer, you’ll encounter three main channels: local distributors, international trading houses, and direct manufacturer exporters. Each has trade-offs. Distributors provide small lots and local language support but add a margin (often 10–20%). Trading houses may aggregate multiple products but lack quality control over the source. Direct from a manufacturer like Weifang Hailei Fine Chemical Co., Ltd. cuts out intermediaries, gives you clearer technical communication, and frequently offers more competitive pricing for bulk orders.
For fertilizer importers, partnering with a Chinese manufacturer that holds REACH registration or meets your region’s regulatory requirements simplifies the import process. For glass and aluminum sectors requiring consistent chemistry, direct relationships ensure lot-to-lot consistency. Should your operation also require other potassium compounds—such as when you need to buy alum potassium aluminum sulfate for water treatment or leather tanning—a supplier with a broad product portfolio can consolidate shipments and reduce logistic headaches. While the focus of this article is potassium sulfate, Hailei Chemical also supplies high-purity potassium aluminum sulfate (alum); reach out to inquire about combined procurement opportunities.
Weifang Hailei Fine Chemical Co., Ltd. brings over a decade of export experience specifically in fine chemicals, positioning us to offer competitive price potassium sulfate without compromising on the quality metrics that matter most. Our potassium sulfate is manufactured via the Mannheim process, routinely achieving 51% K2O content, water solubility exceeding 99%, and chloride below 0.5%. Production runs are monitored with in-house quality labs, and every shipment is accompanied by a detailed CoA.
We understand that price sensitivity does not mean quality can be sacrificed. That’s why we offer flexible packaging options—from 25 kg PP/PE bags to 1,000 kg FIBCs—and shipping configurations (FCL/LCL) to minimize landed cost. Our logistics team manages documentation, fumigation, and container loading precisely to your order, ensuring you receive exactly what you contracted.
Moreover, we help you navigate seasonal volatility by allowing forward bookings with price-hedging mechanisms where appropriate. A direct conversation about your annual volume can unlock volume discounts and preferential allocation during peak seasons. Ready to move beyond “just a quote” and build a real supply partnership? Request a free quote today and let our team tailor a potassium sulfate supply plan to your exact specifications.
Buyers from the pharmaceutical sector sometimes ask, “is potassium sulfate good for you?” The answer depends on context. Potassium sulfate is not a dietary supplement for direct human consumption; it is used as an excipient in controlled-release drug formulations and as a laboratory reagent. In these roles, it meets strict pharmacopeial standards for purity, heavy metals, and microbial limits. For industrial operators, potassium sulfate is non-flammable and stable under normal storage conditions. However, standard safety protocols should be observed: avoid dust inhalation, wear protective gloves and eyewear when handling large quantities, and store in a dry, ventilated area away from strong acids. The product’s safety data sheet (SDS)—which Hailei Chemical provides with every shipment—details emergency procedures, toxicity data, and environmental precautions. So, while it’s not “good for you” in the nutritional sense, it is a safe, regulated industrial chemical when handled correctly.
To make the evaluation framework concrete, consider a hypothetical but typical scenario. Importer A receives two offers for 200 MT of K2SO4 agricultural grade:
On the surface, Supplier X is $25/MT cheaper, saving $5,000 on the order. However, the effective K2O delivered per tonne is lower with Supplier X, and the high chloride may render it unsuitable for chloride-sensitive berry growers—potentially causing a rejection by Importer A’s end customers. The real cost of that cheaper price could be a lost contract, demurrage fees, or a damaged reputation. Supplier Y’s slightly higher price includes documented quality assurance that protects the importer’s business. When you calculate the true value per pound of usable K2O and the risk mitigation, Supplier Y’s quote actually offers lower total ownership cost. This is why a naked price potassium sulfate comparison is insufficient. (For a customized quotation from Hailei Chemical, simply visit our Get a Quote page.)
Global supply chains are increasingly volatile. Partnering with a manufacturer that invests in quality infrastructure, holds ample stock, and communicates proactively is an investment in resilience. Hailei Chemical’s integrated production allows for batch-specific customization—whether you require pharmaceutical-grade with low endotoxin levels or a specific particle size for a fertilizer blend—while maintaining consistent pricing frameworks. As you search where to buy potassium sulfate fertilizer for the long term, look beyond this month’s price list and evaluate the supplier’s overall reliability. A supplier that views you as a strategic partner will work with you on multi-year contracts, flexible delivery schedules, and technical support.
In conclusion, the quest for the best price potassium sulfate need not be a gamble. By applying a robust supplier evaluation framework, understanding the cost drivers, and prioritizing verified quality, procurement professionals can secure potassium sulfate that performs reliably in the field or factory. Whether you need high-purity sulfate for a pharmaceutical excipient or chlorine-free fertilizer for a vineyard, Hailei Chemical stands ready to be that trusted partner. Start a conversation today: Request your competitive quote now and experience the value of a supplier that aligns price with performance.
When sourcing specialty chemicals, many industrial buyers ask: what is potassium aluminum sulfate, and how does it differ from the more familiar potassium sulfate? The two compounds share part of a name but are chemically distinct, with separate property profiles, safety requirements, and application areas. For procurement managers overseeing fertilizer blends, glass batches, or pharmaceutical excipients, confusing these materials can lead to costly formulation errors. In this comprehensive guide, we clarify the identity of potassium aluminum sulfate, compare it head-to-head with premium potassium sulfate (K2SO4) from Weifang Hailei Fine Chemical, and explain why industrial buyers consistently choose our bulk potassium sulfate for high-value applications where chlorine sensitivity or purity is paramount.
Before we dive into the industrial value of potassium sulfate, it’s worth answering the question outright: what is potassium aluminum sulfate? Also known as potash alum or simply alum, potassium aluminum sulfate is a chemical compound with the formula KAl(SO4)2. In its most common commercial form, it crystallizes as the dodecahydrate, KAl(SO4)2·12H2O, a white to colorless crystalline solid with a molecular weight of roughly 474.39 g/mol. The compound is a double sulfate of aluminum and potassium, meaning it contains two different cations within the same crystal lattice structure. Its properties include high solubility in water (significantly more than potassium sulfate), a slightly acidic pH in solution, and a long history of use as a mordant in textile dyeing, a flocculant in water treatment, and even in food processing as a firming agent.
For B2B buyers, potassium aluminum sulfate is most commonly encountered in municipal and industrial water treatment, where its aluminum ion promotes coagulation and flocculation of suspended solids, or in the paper industry as a sizing agent. It is also sometimes used in leather tanning and as a component in fire extinguisher powders. Crucially for our discussion, potassium aluminum sulfate contains aluminum, which renders it unsuitable for fertilizer use (aluminum can be phytotoxic) and for pharmaceutical applications that demand purely potassium-based mineral supplements. This is where the confusion often arises: buyers searching for a potassium source may inadvertently encounter alum-based products, which do not provide bio-available potassium in a plant-friendly or pharma-grade form.
In contrast, potassium sulfate—also known as sulfate of potash (SOP)—is a straight sulfate containing only potassium and sulfate ions. Its chemical formula is K2SO4, and the MW of potassium sulfate is 174.26 g/mol, making it a much smaller, pure molecule compared to the double salt. For agricultural buyers, the headline advantage is that SOP is a premium chlorine-free potassium fertilizer with a guaranteed analysis of K2O 50% minimum. This makes it the go-to choice for chloride-sensitive high-value crops such as tobacco, citrus, grapes, potatoes, and various greenhouse vegetables. Industrial buyers in the glass sector value potassium sulfate as a flux and refining agent that improves clarity, reduces bubble formation, and enhances the mechanical strength of flat glass, container glass, and specialty optical products. In the aluminum recycling industry, K2SO4 serves as an exothermic flux that promotes coalescence of molten aluminum droplets while protecting the melt from oxidation—without introducing harmful chlorides or fluorides. And in pharmaceutical manufacturing, potassium sulfate meets stringent purity standards for use as an excipient in osmotic drug delivery systems and as a mineral supplement formulation component.
Because potassium sulfate is produced via the reaction of potassium chloride with sulfuric acid (or through natural brine processing), the quality of raw materials and process control is paramount. Hailei Fine Chemical offers bulk potassium sulfate in powder, granular, and soluble crystal forms, each tailored to specific end uses. Our standard export packaging includes 25 kg woven bags, 1000 kg FIBC big bags, and custom-labeled options, all with full chemical and traceability documentation.
To eliminate any residual confusion, the following table and commentary outline the most critical differentiators an industrial buyer must evaluate when comparing these two materials:
The root of many procurement mix-ups lies in the fact that both compounds contain potassium and sulfate in their names and both can be offered as white crystalline powders. Here are the key industrial segments where buyers need to apply extra diligence:
The fertilizer industry is the single largest consumer of bulk potassium sulfate. Specialty fertilizer importers and blenders know that potassium aluminum sulfate cannot substitute for SOP because aluminum is not an essential plant nutrient and can cause root damage, stunting, and reduced yields. Blended fertilizers that require low-chloride, high-K analysis must be based exclusively on SOP or potassium nitrate. This is why our SOP granules are designed for direct blending with urea, MAP, DAP, and micronutrients without caking or segregation.
The high-temperature glass-making process demands pure raw materials. Potassium sulfate functions as a fining agent that aids in the removal of gaseous inclusions from the melt, while also contributing potassium ions that alter the thermal expansion coefficient and chemical durability of the end product. Aluminum-based fining agents behave differently and can impart unwanted tinting or clouding in ultra-clear float glass. When buyers ask about the relationship between sulfuric acid and glass production, we explain that potassium sulfate is typically derived from a controlled reaction of potassium chloride with sulfuric acid, and residual acid control is a key quality parameter. Our SOP meets the strictest limits on free acid and heavy metals, ensuring smooth glass furnace operations without refractory corrosion.
In aluminum recycling, potassium sulfate serves as a low-temperature flux that covers the aluminum melt, reducing metal loss to oxidation (drossing loss). It does not introduce the sodium or chlorine that can lead to intermetallic inclusions in aircraft-grade secondary alloys. Alum, conversely, would introduce aluminum oxides and distort the melt composition. Therefore, scrap processors and secondary smelters specify only pure potassium sulfate, typically in a granular form that blends well with other flux salts.
Potassium sulfate’s role as an excipient in osmotic pump tablets and as a source of potassium ions for electrolyte supplements requires the material to comply with pharmacopeia monographs (USP, EP, BP). Alum does not appear in these monographs and cannot be used interchangeably. Our pharma-grade potassium sulfate is produced in dedicated, segregated facilities and ships with full Certificates of Analysis including assays for aluminum, arsenic, lead, and microbial limits.
The connection between sulfuric acid and glass is more than just a raw-material origin story. While sulfuric acid itself is used in glass etching and cleaning processes, its role as the manufacturing precursor for high-purity potassium sulfate is what matters to batch house managers. At Hailei Chemical, we employ the Mannheim process (KCl + H2SO4 → KHSO4 + HCl, followed by conversion to K2SO4 with additional KCl) under tight stoichiometric control. This delivers a product with minimal residual chloride and a sulfate content that enhances the melt’s refining capability. Glass producers relying on our bulk SOP report faster seed elimination, fewer cord defects, and a 2–4 % improvement in yield in borosilicate and soda-lime glass lines. Every shipment includes a detailed particle size distribution report, because a consistent mesh range prevents segregation in the batch plant silos and ensures uniform melting behaviour.
When sourcing bulk potassium sulfate, industrial buyers must evaluate more than just price per metric ton. A reliable supplier provides:
For buyers who are still differentiating among various potassium compounds, it’s also useful to address what is potassium sulfide. Potassium sulfide (K2S) is an entirely different chemical—a red to yellow crystalline solid with a strong rotten-egg odour, used primarily in analytical chemistry and pyrotechnics, not in fertilizers or glass. It bears no functional relationship to potassium sulfate and should never be considered as a substitute. Hailei manufactures only sulfates, ensuring no cross-contamination.
At the B2B level, potassium aluminum sulfate (alum) is generally cheaper per kilogram because it is a less refined bulk chemical. However, for applications that require pure potassium without aluminium, the cost of failure far outweighs the per-unit price difference. Using alum in SOP-sensitive applications can lead to crop damage claims, failed glass quality audits, or off-spec pharmaceutical batches. Hailei’s potassium sulfate is competitively priced for its 99.5 % purity level, with volume discounts for container-load orders.
No. Potassium sulfate does not release aluminium ions and therefore has no flocculation or coagulation properties. It is not a water treatment chemical.
Store potassium sulfate in a cool, dry warehouse away from strong acids and moisture. It is hygroscopic only at very high relative humidity, so standard container freight conditions are sufficient. Avoid stacking FIBCs more than two high to prevent product compaction. Shelf life is 24 months under proper conditions.
Yes. We offer free 500 g samples for lab analysis, with delivery by courier. Contact our sales team to request a sample along with the latest COA and SDS.
Understanding what is potassium aluminum sulfate is the first step toward making informed procurement decisions that protect your product quality and supply chain integrity. Potassium sulfate remains the chlorine-free, high-purity workhorse for fertilizer, glass, aluminum, and pharmaceutical industries—and Hailei Fine Chemical stands ready as your long-term partner. For detailed specifications, a tailored quotation, or to discuss custom packaging and logistics, request a quote today. Let us help you transition from confusion to confidence with a premium potassium sulfate supply that meets every grade and volume requirement.
When sourcing potassium-based chemicals, understanding the distinction between potash vs potassium sulfate is crucial. Though the terms are often used interchangeably in casual conversation, they refer to very different chemical profiles, applications, and performance characteristics. For procurement managers, agronomists, and chemical engineers, this knowledge directly impacts product quality, crop yield, process efficiency, and ultimately, the bottom line.
In this comprehensive guide, we’ll dissect the key differences, explore the specific use cases for each product, and provide actionable insights to help you make a confident sourcing decision. Whether you’re searching for a chlorine-free fertilizer, a glass melting agent, or a pharmaceutical excipient, you’ll finish reading with a clear understanding of why potassium sulfate often comes out on top.
First, let’s clarify what “potash” actually means. Historically, potash referred to potassium carbonate derived from wood ashes. Today, in industrial and agricultural contexts, it’s a blanket term that covers a range of potassium-bearing salts, ores, and refined products. The primary value of any potash material is its water-soluble potassium content, expressed as equivalent potassium oxide (K2O).
The most common form of commercial potash is potassium chloride (KCl), often called muriate of potash (MOP). MOP accounts for over 90% of global potassium fertilizer consumption. It’s cost-effective and widely available, but it contains roughly 47% chloride by weight. That chloride content is a dealbreaker for many high-value crops and certain industrial processes.
Other forms of potash include potassium sulfate (SOP), potassium nitrate (NOP), and blends. So when a buyer asks for “potash”, they could be looking for any of these. The first task of a smart supplier is to pinpoint which potassium compound the application truly demands.
Potassium sulfate (K2SO4), also referred to as sulfate of potash (SOP), is a premium potassium compound containing around 50% K2O and 18% sulfur. Unlike MOP, it is virtually free of chloride (<1%), making it the preferred choice for chloride-sensitive crops such as tobacco, potatoes, citrus fruits, grapes, and many vegetables. Its low salt index also reduces the risk of soil salinization and root burn, even under intensive fertigation.
But potassium sulfate’s utility goes far beyond agriculture. Its high melting point (1,069 °C), chemical purity, and consistent particle size distribution make it invaluable in glass manufacturing, aluminum recycling, gypsum board production, and even pharmaceutical processing. When you purchase potassium sulfate from a dedicated manufacturer like Hailei Chemical, you get a rigorously controlled product tailored to your industry’s exacting requirements.
The potash vs potassium sulfate decision is not merely about swapping one fine white powder for another. The differences cascade through handling, storage, application, and final product quality. The table below summarizes the critical comparison points; however, in practice, the nuances are even more significant.
For a procurement manager, this means that ordering “potash” without specifying the type could result in a shipment of MOP that is completely unusable for a glass factory or a specialty fertilizer blender. Precision matters.
The most prominent battleground for potash vs potassium sulfate is in specialty crop fertilization. While MOP dominates the commodity corn and soybean markets, SOP rules the high-value segment. Here’s why:
Fertilizer importers and blenders who target this premium market segment need a reliable, consistent sulfate of potash supplier. Hailei Chemical’s SOP, guaranteeing a minimum of 50% K2O and water-soluble sulfur, aligns with the specifications demanded by the world’s most discerning growers.
A question that frequently arises in technical procurement discussions is, is potassium sulphate a salt? From a chemical standpoint, yes: any ionic compound formed from the neutralization reaction of an acid and a base is a salt. Potassium sulfate is the potassium salt of sulfuric acid. However, in agricultural and industrial practice, the term “salt” often carries negative connotations of sodium chloride or chloride-based salinity.
Potassium sulfate is fundamentally different from what most people imagine when they hear “salt.” It does not contain sodium or chloride in harmful amounts, and its salt index is less than half that of potassium chloride. In fact, it is the go-to potassium source for saline soils where minimizing additional osmotic stress is paramount. So, while you can technically describe SOP as a salt, it behaves more like a strategic nutrient carrier than a salinity hazard. This distinction is vital when communicating with agronomists and technical buyers who may be wary of anything classified as a “salt.”
Occasionally, buyers confuse potassium sulfate with potassium aluminum sulfate (KAl(SO4)2), commonly known as potash alum. The use of potassium aluminum sulfate is entirely different. This double salt is primarily employed as a mordant in textile dyeing, for water flocculation, in paper manufacturing, and in certain food and pharmaceutical applications as an astringent or firming agent. It contains aluminum, which makes it unsuitable for fertilization or high-temperature glass making.
Potassium aluminum sulfate, while also a source of potassium, has a lower K2O concentration (around 9–11%) and releases aluminum ions that can be phytotoxic if applied to soil in large quantities. Its melting point is much lower (92–95 °C for the hydrated form), and it decomposes before reaching the temperatures where potassium sulfate shines as a glass flux.
If your specification calls for potassium sulfate—whether for agriculture, glass, or pharmaceuticals—do not accept potassium aluminum sulfate as an alternative. Always verify the chemical formula on the certificate of analysis. The two share a name but serve completely different functions.
While the majority of global SOP production feeds the specialty fertilizer market, a substantial and growing share serves industrial manufacturing. Understanding these applications helps buyers appreciate the value of high-purity potassium sulfate and why potash vs potassium sulfate is a pivotal choice in non-agricultural settings as well.
In glass production, potassium sulfate acts as a fining agent, refining melt dynamics by reducing bubble formation and improving homogeneity. Because potassium ions have a larger ionic radius than sodium, they enhance the brilliance and clarity of crystal glass, optical lenses, and high-end tableware. Most importantly, SOP is a chloride-free source of potassium, preventing the formation of volatile chloride compounds that cause streaking, surface defects, and corrosion of furnace refractories. Specifying 99% purity potassium sulfate from a trusted potassium sulfate manufacturer is non-negotiable for premium glassmakers.
In aluminum scrap recycling, a mixture of salts is used to form a protective flux layer that prevents oxidation of the molten metal. Potassium sulfate serves as a critical component of chlorine-free flux blends, especially for alloys that are sensitive to chloride-induced corrosion. The SOP helps lower the melting point of the dross, improves metal recovery rates, and minimizes harmful fume generation. For recyclers pursuing ISO 14001 goals, a low-chloride flux built around potassium sulfate offers both technical and environmental compliance.
High-purity potassium sulfate is incorporated into certain gypsum formulations to accelerate setting times and enhance fire resistance. In wallboard production where consistent curing speed is essential, SOP acts as a reliable accelerator without introducing chlorine ions that could compromise the integrity of embedded steel studs.
In pharmaceutical manufacturing, potassium sulfate may be used as a bulking agent, electrolyte source, or as part of a controlled-release matrix. The pharmacopoeial grades demand extremely low heavy metal levels and particle size uniformity, which Hailei Chemical can supply under strict quality management systems.
When comparing suppliers of potassium sulfate, buyers must look beyond price per metric ton. The true cost of ownership includes purity, consistency, packaging, and logistic reliability. Typical specifications for a premium SOP product include:
For industrial users, additional parameters like heavy metals (lead, mercury, cadmium) and particle size distribution are critical. Reputable manufacturers provide third-party SGS or Bureau Veritas certificates with each lot. Packaging options—25 kg woven bags, 1,000 kg jumbo bags, or bulk—should match your handling infrastructure and destination port regulations.
The price potassium aluminum sulfate (alum) is driven by different market fundamentals than potassium sulfate. Alum production relies on bauxite or clay sources and sulfuric acid, whereas SOP pricing correlates with natural mineral deposits (langbeinite or kainite) and Mannheim-process economics. For buyers, it’s important not to cross-reference alum pricing when budgeting for SOP—they are distinct markets.
Key factors influencing potassium sulfate prices include:
Working directly with a potassium sulfate manufacturer like Hailei Chemical can help stabilize your cost structure through long-term contracts, allowing you to lock in volume commitments and transparent pricing formulas that decouple from spot market volatility.
With over two decades of chemical export experience and a dedicated production base in China’s Shandong province, Hailei Chemical delivers technical expertise, consistent quality, and supply chain agility. Our sulfate of potash is trusted by fertilizer blenders across Southeast Asia, glass factories in Europe, and pharmaceutical formulators in North America. By choosing Hailei, you gain:
When you invest in a long-term potassium sulfate manufacturer relationship, you’re not just buying a commodity—you’re securing your production chain. The nuanced differences between potash vs potassium sulfate start to matter less when you have a supplier who knows exactly what your application demands and delivers it, every time.
Ready to source high-purity potassium sulfate with confidence? Request a quote today, or visit our potassium sulfate product page for full technical specifications and current availability. Let’s discuss how Hailei Chemical can support your business growth.
When sourcing potassium sulphate—also known as sulfate of potash (SOP)—for high‑value agriculture or precision industrial processes, one of the first technical parameters procurement specialists examine is potassium sulphate molecular weight. With a precisely defined value of 174.26 g/mol for the anhydrous K2SO4 molecule, this figure is far more than a chemistry textbook entry. It directly influences purity verification, stoichiometric calculations for batch formulations, and the predictable solubility behaviour that underpins everything from chloride‑free drip irrigation to pharmaceutical excipient quality. In this comprehensive guide, we explain why molecular weight matters, how it connects to the potassium sulfate chemical formula K2SO4, and what every B2B buyer should know about potassium sulfate solubility in water, real‑world performance, and reliable sourcing—drawing on decades of expertise from Weifang Hailei Fine Chemical Co., Ltd.
The potassium sulfate chemical formula K2SO4 tells a concrete story about composition. Each formula unit consists of two potassium cations (K+) and one sulfate anion (SO42‑). For procurement professionals, this simple notation unlocks a wealth of quality‑control data. Based on the standard atomic weights (K = 39.10, S = 32.07, O = 16.00), the theoretical molecular weight is 2(39.10) + 32.07 + 4(16.00) = 174.26 g/mol. Any deviation in an assay result from this figure suggests the presence of impurities—typically residual chlorides, sodium, or moisture. Because Hailei Chemical’s SOP is manufactured via the Mannheim process using pharmaceutical‑grade potassium chloride and sulfuric acid, our typical potassium sulphate molecular weight‑verified assay consistently delivers K2O content of 50% minimum by weight, with chloride levels below 0.5%. That purity makes it the premier choice for chlorine‑sensitive crops like tobacco, citrus, and avocados, as well as for the most demanding industrial applications.
Industrial users rely on the molecular weight to convert between mass and molar quantities. For example, a glass batch recipe requiring 0.5 mol of K2SO4 as a refining agent translates to exactly 87.13 grams of pure product. If the supplied material contains inert solids or free moisture, a simple stoichiometric calculation based on 174.26 g/mol becomes unreliable, potentially compromising furnace efficiency or glass clarity. Similarly, in pharmaceutical excipient formulation, the molecular weight is used to establish exact ionic contributions. Hailei Chemical attaches a Certificate of Analysis to every shipment, confirming the assay against the theoretical molecular weight—giving your quality team full confidence.
Beyond its molecular weight, potassium sulfate solubility in water is the most operationally critical physical property. K2SO4 dissolves endothermically, and its solubility shows a marked but manageable dependence on temperature.
| Temperature (°C) | Solubility (g K2SO4 / 100 g H2O) |
|---|---|
| 0 | 7.4 |
| 10 | 9.3 |
| 20 | 11.1 |
| 30 | 13.0 |
| 40 | 14.8 |
| 60 | 18.2 |
| 80 | 21.4 |
| 100 | 24.1 |
This moderate solubility, compared to highly soluble salts like potassium chloride, makes SOP especially suited for controlled‑release fertilizer blends and for applications where a steady, low‑concentration potassium source is desired—such as in foliar sprays or drip fertigation of premium greenhouse crops. It also explains SOP’s role as a refining agent in glass furnaces, where a precisely timed dissolution is needed to scavenge gaseous inclusions without creating refractory corrosion.
Buyers from aluminium recycling plants appreciate another facet: during the remelting of aluminium scrap, K2SO4 is used as a flux component to lower the melting point of oxide slag and improve metal recovery. The salt’s solubility curve guarantees that any residual flux on the recovered dross can be washed away with ambient‑temperature water, simplifying post‑treatment while keeping chloride‑induced corrosion out of the system. When you buy potassium sulfate from Hailei Chemical, you receive material ground to your specified particle size, ensuring dissolution kinetics align with your specific process window.
The overwhelming volume of SOP is consumed by agriculture, where its low chloride index is unmatched. Understanding the molecular weight is essential for fertilizer formulators to calculate the K2O equivalent. K2O has a molecular weight of 94.20 g/mol, and one mole of K2SO4 (174.26 g) yields one mole of K2O. The theoretical K2O percentage is therefore (94.20 ÷ 174.26) × 100 = 54.0%. Our commercial product guarantees a minimum of 50% K2O—a figure that accounts for small amounts of benign sulphate residuals and packaging‑related tolerances. Agricultural procurement teams use this conversion constantly when comparing SOP with potassium chloride (MOP) or potassium nitrate. Because SOP delivers both potassium and sulphur in the sulphate form, it simultaneously supports protein synthesis and enzyme activation without the osmotic stress that chloride can impose on sensitive root zones.
Agronomists calculate field application rates in kg K2O per hectare. With a guaranteed 50% K2O, a 100‑kg sack of Hailei SOP delivers 50 kg of K2O. A recommended rate of 200 kg K2O/ha for a high‑yield banana plantation therefore requires 400 kg of product per hectare. The same stoichiometric logic, rooted in the potassium sulphate molecular weight, empowers precise blending with monoammonium phosphate (MAP) and urea to create custom NPK grades without over‑ or under‑supplying sulphur. This calculability reduces over‑fertilisation risk and helps your downstream customers meet increasingly stringent environmental targets.
In the production of container glass, float glass, and specialty optical products, K2SO4 functions as a high‑temperature refining agent. Added in quantities typically ranging from 0.1 to 0.5 wt% of the batch, it decomposes above 1,100 °C, releasing sulphur dioxide that helps homogenise the melt and eliminate bubbles. The molecular weight is used by furnace operators to calculate the exact SO2 yield per kilogram of refining agent. Given that one mole of K2SO4 yields one mole of SO2 (64.06 g), a 1,000‑gram addition of pure SOP can theoretically release up to 367 grams of SO2. Predictability of this kind is invaluable when fine‑tuning a furnace that operates 24/7. Hailei Chemical supplies SOP in controlled granular and powder forms to ensure safe handling and consistent metering into the batch house.
Secondary aluminium smelters face the constant challenge of minimising metal loss to dross while avoiding chloride‑based fluxes that generate corrosive HCl fumes. Potassium sulphate provides a chloride‑free alternative that improves slag fluidity by lowering the liquidus temperature of the oxide skin. Its moderate solubility also helps in subsequent dross leaching steps, allowing valuable aluminium residues to be recovered without aggressive chemical treatments. When buyers seek to buy potassium aluminum sulfate—often confusing the two—they are typically looking for potash alum, which has a completely different chemistry (KAl(SO4)2·12H2O) and is used as a coagulant in water treatment, not as a slag conditioner. Understanding the chemical formula and molecular weight prevents such mis‑specifications and ensures you procure exactly what your process demands.
Pharmacopoeia‑grade potassium sulphate is used as an excipient in tablet formulations and as a component of mineral supplements. Here, the molecular weight is not a mere specification but a regulatory requirement. Monographs test for assay (typically 98.5–101.5% of theoretical K2SO4) and limit heavy metals, arsenic, and loss on drying. A product whose assay when tested against the 174.26 molecular weight falls outside this narrow window will be rejected. For pharmaceutical manufacturers, Hailei Chemical provides a dedicated low‑endotoxin grade screened through 200 mesh, supported by a full pharmacopoeial compliance dossier.
Procurement managers occasionally search for “alum potassium aluminum sulfate” when they actually need potassium sulphate. While both chemicals supply potassium ions, their applications diverge sharply. Alum (potassium aluminum sulfate) is a double sulphate salt with a molecular weight of 474.39 g/mol (dodecahydrate) and a strong astringent taste; it finds use in water purification, leather tanning, and as a mordant in textile dyeing. By contrast, our potassium sulfate chemical formula K2SO4 yields a neutral pH, low‑reactivity salt ideal for chloride‑free fertilisation and industrial fluxing. If your goal is to buy potassium aluminum sulfate, you will need a completely different specification sheet. This article focuses on potassium sulphate; for alum requirements, we recommend consulting a specialist supplier of aluminium salts.
The lesson is clear: always verify the chemical formula and molecular weight against your process requirement. When in doubt, request a sample and a certificate of analysis that quotes the assay relative to the theoretical molecular weight. Hailei Chemical welcomes such scrutiny and provides full technical documentation with every shipment.
Weifang Hailei Fine Chemical Co., Ltd. is one of China’s foremost manufacturers and exporters of premium potassium sulphate. Our production capacity exceeds 100,000 metric tonnes per year, backed by on‑site quality laboratories that verify potassium sulphate molecular weight conformity, particle size distribution, chloride content, and heavy metal levels in accordance with ISO 9001:2015 standards. We export to over 55 countries, servicing major fertiliser blenders, container‑glass multinationals, secondary aluminium smelters, and pharmaceutical grade distributors.
Every container of Hailei potassium sulfate is accompanied by a detailed COA, a safety data sheet, and, for agricultural grades, a product stewardship card outlining solubility and handling best practices. Our supply chain team can arrange packaging in 25 kg, 50 kg, or 1000 kg jumbo bags, with options for palletised and shrink‑wrapped shipping to prevent moisture ingress. For pharmaceutical clients, we provide aluminium‑foil‑lined fibre drums and dedicated lot traceability.
By anchoring your procurement decision on technical fundamentals—potassium sulphate molecular weight, the potassium sulfate chemical formula, and potassium sulfate solubility in water—you mitigate quality risk and unlock the full performance potential of this versatile inorganic salt. Whether you need SOP for a tobacco fertilizer programme, a float glass line, or a pharmaceutical excipient application, Hailei Chemical is ready to partner.
Take the next step: request a tailored quotation or download our latest specification sheet. Our technical sales engineers will respond within one business day to discuss your required chemical parameters, packaging preferences, and delivery timeline. Let’s transform your molecular‑weight knowledge into a reliable, cost‑effective supply chain.
If you’ve ever searched “what is potassium sulfide,” you’re likely trying to identify the correct industrial chemical for your procurement needs—and you may actually be looking for potassium sulfate. At Weifang Hailei Fine Chemical Co., Ltd., we frequently hear from fertilizer importers, glass manufacturers, and pharmaceutical buyers who start with this query. This confusion is understandable: both compounds share the potassium element but have vastly different properties, uses, and safety profiles. In this buyer-focused guide, we’ll address exactly what potassium sulfide is, why it’s mistaken for potassium sulfate, and how to confidently select the premium K2SO4 product your application demands.
Potassium sulfide (K2S) is an inorganic compound formed by the reaction of potassium metal with sulfur. Chemically, it exists as a yellow-brown or colorless crystalline solid with a characteristic rotten-egg odor due to the release of hydrogen sulfide when exposed to moisture. With a molecular weight of 110.26 g/mol, K2S is highly reactive, deliquescent, and corrosive. It must be handled under strict safety protocols, including inert atmosphere storage, because it reacts violently with acids, water, and oxidizing agents.
In industrial contexts, potassium sulfide has limited direct applications. It is occasionally used in the preparation of other potassium compounds, as a laboratory reagent for analytical chemistry, and historically in depilatory formulations. However, its instability and hazardous nature make it unattractive for large-scale commercial operations. Most inquiries that begin with “what is potassium sulfide” actually stem from a misspelling or conceptual mix-up with potassium sulfate—a much more stable, high-demand commodity. Understanding this distinction can save your business time, money, and potential safety risks during international sourcing.
The primary source of confusion lies in the similar “-sulfide” and “-sulfate” suffixes. While potassium sulfide is K2S, potassium sulfate is K2SO4—a white crystalline salt containing sulfur in its highest oxidation state (sulfate) rather than the reduced sulfide form. The difference radically alters chemical behavior, applications, and regulatory status. For example, potassium sulfate is a premium chlorine-free fertilizer, a critical glassmaking flux, and a pharmaceutical excipient. Potassium sulfide would be entirely unsuitable for these uses due to its toxicity and corrosive nature.
This guide targets procurement professionals who type “what is potassium sulfide” into search engines but truly need information on potassium sulfate’s specifications, pricing, and supplier qualification. By clarifying the terminology, we aim to connect you with the exact industrial chemical your operation requires—high-purity potassium sulfate (SOP) manufactured to international standards.
Before diving deeper into potassium sulfate, it’s helpful to understand the fundamental importance of potassium (K) across industries. The element potassium is a highly reactive alkali metal that is never found in its pure form in nature but is essential to all living organisms as a primary nutrient. Its compounds play vital roles in agriculture (NPK fertilizers), glass manufacturing (fluxes to reduce melting temperatures), industrial cleaning (potassium hydroxide soaps), and pharmaceuticals (electrolyte replenishment). The query “what are the uses of potassium” reflects this broad relevance.
For most B2B buyers, however, the focus quickly narrows to specific potassium salts like potassium chloride (MOP), potassium nitrate, and potassium sulfate. Among these, potassium sulfate stands out for its chloride-free profile, making it indispensable for chloride-sensitive high-value crops and for industrial processes where chloride contamination is unacceptable.
Potassium sulfate (sulfate of potash, SOP) is the stable, high-performance cousin of potassium sulfide. At Weifang Hailei, our premium K2SO4 product contains a minimum of 50% K2O, with less than 2.5% chlorine, and free-flowing crystalline granules. This quality profile supports a diverse range of applications that no potassium sulfide could ever fulfill.
The agricultural sector is the largest consumer of potassium sulfate. Unlike potassium chloride (MOP), SOP provides essential potassium without the harmful chloride ion, making it ideal for fruits, vegetables, tobacco, tea, coffee, and ornamentals. With a K2O content guaranteed at 50% min., our SOP improves crop yield, drought resistance, and fruit quality. International fertilizer importers consistently seek granular or powder potassium sulfate for blending into NPK compounds and direct application.
Explore potassium sulfate specifications for specialty fertilizers.
In the glass industry, “sulfuric acid and glass” might seem unrelated, but the connection is crucial. Potassium sulfate is used as a refining agent and flux in the production of high-quality glass, including optical lenses, television tubes, and crystal glassware. It lowers the melting temperature of silica, aids in the removal of bubbles, and improves chemical durability. While sulfuric acid is a raw material in the Mannheim process for manufacturing potassium sulfate, the compound itself directly contributes to glass quality. Our product’s high purity ensures minimal trace metals that could discolor or weaken the final glass product.
The keyword “aluminium potassium sulfate” refers to potash alum, a different compound entirely, but it highlights the intricate world of potassium derivatives. In the pharmaceutical sector, potassium sulfate itself is recognized in monographs such as USP-NF as an excipient and active ingredient in specific electrolyte formulations. Potassium sulfate medication use includes its role as a potassium supplement in controlled-release tablets and parenteral nutrition, though it must meet stringent pharmacopoeia standards (e.g., heavy metals <10 ppm, arsenic <1 ppm). Our halal- and kosher-certified production lines can supply pharmaceutical-grade potassium sulfate under strict quality assurance protocols.
In aluminum recycling, potassium sulfate serves as a salt flux to protect molten aluminum from oxidation and to enhance metal recovery rates. Its low chloride content prevents corrosion of furnace linings and improves workplace safety. Additionally, potassium sulfate is used as an additive in gypsum board to control setting time and improve fire resistance, and in the production of dyes, ceramics, and explosives. These diverse uses underscore why discerning buyers prioritize a reliable, consistent source of this compound.
When transitioning from “what is potassium sulfide” to procuring potassium sulfate, understanding product specifications is paramount. At Hailei Chemical, we provide detailed certificates of analysis (COA) with every shipment. The critical parameters include:
Always request a pre-shipment sample and independent third-party inspection when sourcing from overseas. A trustworthy supplier will accommodate both without hesitation.
China is the world’s leading producer and exporter of potassium sulfate, with Shandong Province—home to Weifang Hailei—serving as a major manufacturing hub. Importers should evaluate several logistics factors to ensure a smooth supply chain:
Experienced buyers know that consistent granular hardness and flowability are essential to prevent caking during ocean transit. We add anti-caking agents upon request and perform drop tests to simulate container movement.
Your initial search “what is potassium sulfide” suggests you are in the early stages of supplier discovery. To avoid missteps, apply this evaluation framework when vetting a potassium sulfate manufacturer or trader:
We encourage you to download our potassium sulfate technical data sheet and compare it with other suppliers’ offerings. This due diligence will protect your company from costly quality claims and supply disruptions.
It bears repeating: no amount of potassium sulfide can replace potassium sulfate in any of the applications discussed. Attempting to use K2S as a fertilizer would result in devastating plant toxicity; introducing it to a glass furnace could create hazardous off-gases. Industrial buyers must insist on correct nomenclature and chemical identification (CAS number 7778-80-5 for potassium sulfate) in purchase orders and shipping documents. Mislabeling or confusion at the documentation stage can lead to customs delays, rejected shipments, and dangerous handling situations.
At Weifang Hailei Fine Chemical Co., Ltd., we take extra care to label all products in both English and Chinese with full chemical names, UN numbers (if applicable), and handling instructions, ensuring clarity throughout the supply chain.
Whether your initial question was “what is potassium sulfide” or you are a seasoned importer seeking a reliable source of high-purity K2SO4, Hailei Chemical is your long-term partner. Our commitment to quality, consistent supply, and customer service has earned the trust of clients across Asia, Europe, the Americas, and Africa. We offer flexible order sizes, customized packaging, and comprehensive technical support to integrate our product seamlessly into your manufacturing or blending process.
Contact us today to discuss your potassium sulfate requirements. Our team is ready to provide a competitive, no-obligation quotation.
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When sourcing industrial chemicals, procurement managers often encounter alum potassium aluminum sulfate and potassium sulfate — two potassium-based compounds that sound similar but serve entirely different markets. While both contain potassium, their chemical structures, properties, and end-use applications diverge significantly. Understanding these differences is essential for making cost-effective, performance-driven purchasing decisions, whether you are a specialty fertilizer importer, glass manufacturer, or pharmaceutical producer. In this comprehensive guide, we clarify the distinctions, address common buyer questions, and help you identify the right compound for your industrial requirements.
Alum potassium aluminum sulfate, commonly known as potash alum or simply alum, is an inorganic salt with the chemical formula KAl(SO4)2·12H2O. This double sulfate salt of potassium and aluminum crystallizes as colorless octahedral crystals and is widely recognized for its astringent and coagulating properties. Unlike potassium sulfate, alum contains aluminum ions that fundamentally alter its behavior in solution and industrial reactions.
Potash alum is produced by reacting aluminum sulfate with potassium sulfate, or from natural minerals like alunite. The resulting hydrated crystals are highly soluble in water, forming an acidic solution that finds use across diverse industries, from water purification to leather tanning and food processing. However, alum’s high aluminum content and acidic pH make it unsuitable for applications requiring neutral, chloride-free potassium nutrition — a role filled exclusively by potassium sulfate.
Buyers seeking alum typically prioritize purity, heavy metal limits, and consistent crystal size distribution. If you are looking for where can i buy potassium aluminum sulfate, dedicated chemical distributors and water treatment suppliers are common sources. However, for agricultural and high-performance industrial uses, potassium sulfate remains the superior choice.
Potassium sulfate (K2SO4), also known as sulfate of potash, is a premium, chlorine-free potassium fertilizer and industrial chemical. Unlike alum potassium aluminum sulfate, potassium sulfate contains no aluminum and delivers 50% minimum K2O content, along with essential sulfur in sulfate form. Its neutral pH and low salt index make it ideal for high-value crops sensitive to chloride, such as tobacco, potatoes, grapes, citrus fruits, and ornamental plants. Beyond agriculture, potassium sulfate is a critical raw material in glass manufacturing, aluminum recycling, pharmaceuticals, and gypsum board production.
At Hailei Chemical’s potassium sulfate product line, industrial buyers can source technical-grade and agricultural-grade material with consistent particle size distribution, minimal insolubles, and full traceability.
One of the most frequent technical inquiries we receive is about potassium sulfate solubility in water. At 20°C, potassium sulfate dissolves at a rate of approximately 111 g/L, rising to about 250 g/L at 100°C. This moderate solubility, compared to more soluble salts like potassium chloride, makes it particularly advantageous in controlled-release fertilizer formulations and in glass batches where gradual potassium release is desired for refining and fluxing. In pharmaceutical manufacturing, the solubility profile ensures predictable dissolution rates for tablet coatings and excipient blends. Understanding these solubility parameters allows process engineers to optimize dissolution tanks, spray drying, and recrystallization steps.
A common query from new buyers is: is potassium sulfate a metal? The short answer is no. Potassium sulfate is an ionic salt composed of potassium cations (K+) and sulfate anions (SO42-). While metallic potassium is a highly reactive alkali metal, the compound potassium sulfate is a stable, white crystalline solid with no metallic properties. It does not conduct electricity in solid form (only when dissolved or molten) and exhibits completely different handling, storage, and safety characteristics compared to metallic potassium. This distinction is critical for proper hazard classification and shipping documentation.
For chemical engineers and procurement specialists, knowing how to make potassium sulfate provides insight into quality variations, cost drivers, and supply chain reliability. Commercially, potassium sulfate is produced through several routes:
Each production route influences the final product’s particle size, purity, and price. Hailei Chemical primarily sources potassium sulfate manufactured via the Mannheim process from audited Chinese producers, ensuring a stable supply chain, heavy metal compliance (below EC limits), and customizable particle size distribution for granulated, crystalline, or powder forms.
The question of where can i buy potassium aluminum sulfate often arises from buyers who initially confuse the two compounds. Potassium aluminum sulfate (alum) is widely available through water treatment chemical suppliers, food ingredient distributors, and leather tanning industry channels. It is typically sold in lump, crystal, or powder form with purity ranging from 99% technical grade to food/pharmaceutical grade. However, if your application actually demands potassium sulfate—for chloride-free fertilization, glass fluxing, or pharmaceutical excipients—purchasing alum would be a costly and performance-compromising mistake.
For procuring high-purity potassium sulfate, industrial buyers should seek specialized chemical exporters with documented quality control, such as Hailei Chemical’s sulfate of potash. We supply technical, agricultural, and pharmaceutical grades, each with certificates of analysis (COA) covering K2O content, moisture, chloride max (typically <0.5%), and heavy metals. Our logistics team manages bulk vessel, container load, or break-bulk shipments to ports worldwide, ensuring on-time delivery.
While alum potassium aluminum sulfate has niche water treatment and tanning roles, potassium sulfate delivers superior value in applications where aluminum toxicity, chloride sensitivity, or soil health matter. Here’s a direct comparison for B2B decision-makers:
These distinctions underscore why industrial procurement teams should clearly define their technical requirements before issuing RFQs. For fertilizer blenders, glass technologists, and pharmaceutical formulators, potassium sulfate offers unmatched compatibility.
Hailei Fine Chemical Co., Ltd. is a trusted Chinese exporter of potassium sulfate with decades of experience serving B2B buyers across five continents. Our potassium sulfate conforms to GB/T 20406-2017 and equivalent international standards, with typical specifications:
We understand that for specialty fertilizer importers, consistent granule hardness is critical to avoid dust and segregation during blending. For glass manufacturers, tight control on iron oxide and heavy metals ensures color quality. Our technical team provides COA documentation, safety data sheets (SDS), and sample shipments to qualify our product before large-scale orders. Through our logistics network, we execute FOB, CIF, and CFR delivery terms to major ports in Southeast Asia, Europe, the Middle East, and the Americas.
Potassium aluminum sulfate (alum) is not recommended as a fertilizer because of its high aluminum content, which can become toxic to plants in acidic soils and provides only minimal potassium per unit weight compared to potassium sulfate. Always use sulfate of potash for agricultural potassium supplementation.
The moderate solubility of potassium sulfate (111 g/L at 20°C) makes it suitable for fertigation systems, controlled-release blends, and direct soil application. It dissolves steadily, reducing leaching losses compared to highly soluble chlorides while still providing plant-available potassium throughout the growing season.
We supply agricultural grade (50% K2O min), water-soluble grade, industrial/technical grade, and pharmaceutical grade, each with tailored heavy metal limits and particle size distributions. Contact our team with your specific application requirements for a customized quotation.
Our standard practice includes providing a pre-shipment sample, a detailed Certificate of Analysis from an ISO 17025-accredited laboratory, and third-party inspection (SGS, Bureau Veritas) upon request. We encourage buyers to test the sample in their own facilities to confirm suitability.
Navigating the industrial chemical landscape requires clarity between similar-sounding products like alum potassium aluminum sulfate and potassium sulfate. While alum has its place in water treatment and tanning, potassium sulfate’s chlorine-free, high-K2O profile makes it the workhorse for modern agriculture, glass production, and pharmaceutical manufacturing. By understanding chemical composition, solubility, and sourcing channels, procurement professionals can avoid costly mismatches and secure a reliable supply of premium potassium sulfate.
If your organization requires high-purity potassium sulfate with consistent quality and global logistics support, Hailei Chemical is ready to assist. Request a quote today and let our technical team help you specify the ideal grade, packaging, and delivery schedule for your business.
Understanding how to use potassium sulfate correctly can make the difference between an optimized industrial process and costly inefficiencies. Potassium sulfate (K₂SO₄), often called sulfate of potash (SOP), is a premium, chlorine-free potassium source valued not only in agriculture but also in glass manufacturing, aluminum recycling, and pharmaceutical production. For procurement managers and process engineers, mastering the material’s solubility, application methods, and quality specifications is essential to achieving consistent results. In this comprehensive guide, we draw on decades of specialty chemical export experience at Weifang Hailei Fine Chemical Co., Ltd. to explain exactly how to use potassium sulfate across its key applications, how to assess its solubility under operational conditions, and what to look for when buying in bulk.
Whether you are formulating a high-value crop nutrition program, specifying a fining agent for a glass furnace, or setting up a scrap aluminum conversion line, this resource will provide actionable, technically sound insights. We will also cover the recovery of potash alum from scrap aluminium—a process that turns industrial waste into a valuable chemical using potassium sulfate as a critical feedstock.
In specialty agriculture, potassium sulfate is the go-to potassium source for chloride-sensitive crops such as tobacco, potatoes, grapes, citrus, and many fruits and vegetables. The absence of chloride prevents salinity buildup and leaf scorching, while the 50–52% K₂O content and 17–18% sulfur supply both macronutrients essential for enzyme activation and protein synthesis. Here is how to use potassium sulfate effectively in fertilizer programs.
Potassium sulfate can be broadcast, banded, or incorporated into the soil prior to planting. For most annual crops, a baseline application of 150–250 kg/ha of granular SOP is recommended, adjusted based on soil test results and crop removal rates. Because potassium is immobile in most soils, band placement 5–8 cm below and to the side of the seed row enhances early root access. For tree crops, deep banding or fertigation is preferred to reach the active root zone.
Granular potassium sulfate fertilizer from Hailei Chemical is sized to match standard spreading equipment, with a typical SGN of 240–280, ensuring uniform distribution. If blending with urea or ammonium phosphates, always verify compatibility to avoid hygroscopic caking.
For drip irrigation and hydroponic systems, only fully soluble grades should be used. Is potassium sulfate soluble? Yes, but its solubility is lower than that of potassium chloride—approximately 110 g/L at 20°C and rising to about 240 g/L at 100°C. This moderate solubility requires careful attention when preparing concentrated stock solutions. We recommend dissolving SOP in warm water (30–40°C) under agitation, then injecting the clear solution into the main flow. Avoid mixing concentrated potassium sulfate with calcium fertilizers, as calcium sulfate (gypsum) can precipitate and clog emitters. Use separate tanks for calcium and sulfate sources, or maintain a dilution ratio above 1:200.
In recirculating hydroponics, maintain a potassium concentration of 150–300 ppm and sulfate at 50–120 ppm, depending on crop stage. Regular solution analysis prevents nutrient antagonisms, particularly with magnesium.
The solubility of potassium sulfate is a common concern for formulators and process engineers. While SOP is not the most soluble potassium salt, its consistent solubility curve and lack of hygroscopicity make it predictable and easy to handle. The following factors govern its behavior in solution.
From a practical B2B standpoint, “soluble” potassium sulfate powder with a 99.0% min purity and sub-200 mesh particle size dissolves rapidly enough for most industrial uses. For pharmaceutical applications requiring endotoxin-free, highly soluble potassium, we recommend our pharma-grade potassium sulfate, which meets Ph.Eur. and USP monographs.
In the glass industry, high-purity potassium sulfate serves as a fining agent and a source of K₂O, which improves the brilliance, durability, and workability of specialty glasses such as crystal, optical lenses, and television screens. If you have ever wondered how to use potassium sulfate in glass batch formulations, the answer lies in its ability to release sulfur trioxide during melting, which helps remove gas bubbles (seeds) from the melt.
Typical SOP addition rates range from 0.2% to 1.5% of the total batch weight, depending on the glass composition and desired K₂O level. Potassium sulfate is mixed with silica sand, soda ash, limestone, and other raw materials before charging into the furnace. The decomposition reaction begins at around 1,100°C, releasing SO₃ which reacts with sodium carbonate to form sodium sulfate, a powerful fining agent that lowers surface tension and promotes bubble release.
Because potassium sulfate contributes both K₂O and SO₃, it can partially replace soda ash and salt cake, simplifying inventory. Glass manufacturers typically require a granular product with a controlled particle size (0.2–1.0 mm) to avoid dusting and segregation. Hailei Chemical supplies technical-grade potassium sulfate for glass production with a guaranteed K₂O content of 50% min and chloride below 0.05%, ensuring no yellowing or corrosion effects in the furnace.
When purchasing potassium sulfate for glass, insist on low iron (Fe₂O₃ < 10 ppm), low chloride, and consistent particle size distribution. Even small variations can shift the redox balance of the melt and affect final color. Our product is tested using ISO 15549 and routinely meets these stringent requirements.
The conversion of scrap aluminum into potash alum (potassium aluminum sulfate dodecahydrate, KAl(SO₄)₂·12H₂O) is a textbook example of industrial symbiosis. However, executing this process at scale demands precise stoichiometry and rigorous safety protocols. Below we detail how to use potassium sulfate to produce potash alum from scrap aluminium, a process widely used in water treatment, leather tanning, and cosmetics.
The yield of potash alum can exceed 90% with precise control. Using Hailei Chemical’s fine-grade SOP (≥99% purity, low heavy metals) ensures a white, high-purity final product that commands premium pricing in markets where color and purity are critical.
In the pharmaceutical sector, potassium sulfate is used as an excipient in controlled-release tablets, an electrolyte replenisher, and a buffering agent. Because it falls under pharmacopoeial monographs, every batch must be accompanied by a Certificate of Analysis (CoA) demonstrating compliance with identity, purity, heavy metal limits (<10 ppm Pb), loss on drying, and endotoxin controls.
Pharmaceutical manufacturers most often use potassium sulfate in the production of enteric-coated potassium supplements. The powder is blended with microcrystalline cellulose and other excipients, granulated with water or isopropanol, and compressed into tablets. Due to its moderate solubility, potassium sulfate provides a slower, more sustained release compared to potassium chloride, which is highly soluble and can cause rapid osmotic shifts. Formulators must carefully control particle size (D90 < 75 µm) to achieve uniform content and dissolution profiles meeting USP specifications.
Our GMP-compliant potassium sulfate is manufactured in a dedicated facility with full traceability and triple-washed to minimize residual solvents. We support DMF filing and provide 3.1 certificates per EN 10204 for every shipment.
When you decide to purchase potassium sulfate bulk, doing the due diligence on supplier reliability, product consistency, and logistics will protect your production schedule. Below are the criteria we recommend verifying with any SOP supplier.
By choosing a manufacturer like Weifang Hailei Fine Chemical Co., Ltd., you gain direct access to a vertically integrated production process that controls raw material sourcing, reaction conditions, and final packaging—eliminating the quality risks associated with intermediate traders.
Even experienced technical staff can make errors that reduce the effectiveness of potassium sulfate. Watch out for these pitfalls:
From boosting tomato yields to polishing crystal glass and recovering aluminum, potassium sulfate is a remarkably versatile industrial chemical. Knowing how to use potassium sulfate correctly in your specific context is the key to unlocking its full value. This guide has walked you through solubility fundamentals, fertilization protocols, glass fining addition, scrap aluminum conversion to potash alum, and pharmaceutical processing—all areas where Hailei Chemical’s technical expertise and consistent product quality can support your business goals.
Ready to secure a reliable, high-purity potassium sulfate supply? Request a quote today and let our team provide the right grade, packaging, and documentation for your application. With a full range of potassium sulfate products—fertilizer, technical, and pharma grade—we are positioned to be your long-term partner in global markets.