For technical buyers and chemical engineers, the molecular structure of a compound is the starting point for evaluating its real-world performance. The potassium and sulfate ion formula – K₂SO₄ – reveals a crystalline salt that dissociates into two K⁺ cations and one SO₄²⁻ anion in solution, dictating its solubility, ionic strength, and compatibility across industries. As a leading potassium sulfate supplier, Weifang Hailei Fine Chemical Co., Ltd. understands that procurement decisions hinge on this fundamental chemistry. This article unpacks the chemical profile of sulfate of potash, connects its ionic behavior to key applications, addresses safety questions, and guides you toward a reliable bulk source.
When we write the potassium and sulfate ion formula, we immediately see a 2:1 stoichiometry: two monovalent potassium ions for every one divalent sulfate ion. This ratio has profound implications. The sulfate ion (SO₄²⁻) is a tetrahedral structure with sulfur at the center, double-bonded to four oxygen atoms, resulting in a stable, fully oxidized anion that does not hydrolyze in water. Potassium ions (K⁺) are highly mobile and participate in cation exchange – a critical factor in soil chemistry and industrial fluxes. Together, they form a neutral salt with a molar mass of 174.259 g/mol, high melting point (1,069°C), and exceptional thermal stability.
In aqueous systems, K₂SO₄ rapidly dissolves to release ions according to the equation K₂SO₄(s) → 2K⁺(aq) + SO₄²⁻(aq). The solubility is 120 g/L at 25°C, which provides a moderate ionic strength without the extreme hygroscopicity of other potassium salts. This solubility profile is ideal for fertigation systems, where clogging must be avoided, and for glass furnaces, where controlled melt viscosity is essential. The potassium and sulfate ion formula thus directly governs handling characteristics: low caking tendency, free-flowing granules, and compatibility with most blending systems.
For specialty fertilizer importers, chlorine-free nutrition is non-negotiable for high-value crops like tobacco, potatoes, grapes, and citrus. The sulfate ion in K₂SO₄ provides sulfur in a plant-available form (SO₄²⁻) while potassium (K⁺) drives osmoregulation and enzyme activation. Unlike potassium chloride (KCl), the absence of chloride in K₂SO₄ prevents leaf burn and soil salinity buildup. The ionic dissociation ensures rapid uptake: K⁺ enters roots via selective ion channels, and sulfate is actively transported by dedicated permeases.
Because the potassium and sulfate ion formula yields ions with low charge density, they do not strongly adsorb to clay particles, allowing mobility in the root zone. K₂SO₄ has a low salt index (43) compared to KCl (116), making it safer for seedling applications and drip irrigation. Its acidifying effect on soil is minimal because the sulfate ion does not undergo significant hydrolysis – a key differentiator in acidic tropical soils where Al³⁺ toxicity is a concern.
Our premium potassium sulfate fertilizer guarantees K₂O ≥ 50%, Cl ≤ 1.5%, and moisture ≤ 1.5%, strictly controlled to secure these agronomic benefits.
In float glass and container glass production, sulfate ions act as fining agents. At melting temperatures above 1,200°C, the sulfate ion decomposes to release SO₃, which forms large bubbles that sweep away fine gaseous inclusions (seeds). The potassium ion simultaneously modifies the glass network, reducing the tendency to devitrification and improving chemical durability. Precise stoichiometry from the potassium and sulfate ion formula ensures consistent dosage without excess alkali that could degrade refractory linings.
Secondary aluminum smelters use potassium sulfate-based flux blends to cover molten metal, prevent oxidation, and coalesce dross. The low melting eutectic formed by K₂SO₄ with other salts provides a liquid barrier that traps inclusions. Here, the potassium ion’s ionic radius (138 pm) is larger than sodium’s, offering a less aggressive reaction with furnace refractories. If you’re asking where to buy potassium aluminum sulfate for similar flux applications, note that mixture is potash alum (KAl(SO₄)₂·12H₂O), a different product with crystallization water. For anhydrous fluxing, pure potassium sulfate is often preferred. Hailei Chemical supplies both grades – contact our team for technical guidance.
The pharmaceutical industry utilizes K₂SO₄ as a tablet filler and a source of potassium ions in oral rehydration salts, where purity is paramount. The absence of nitrogen or phosphate in the potassium and sulfate ion formula makes it an inert electrolyte carrier, meeting USP/EP monographs. Our pharmaceutical-grade potassium sulfate passes heavy metals ≤ 10 ppm, arsenic ≤ 2 ppm, and loss on drying ≤ 0.5%.
A common inquiry among procurement managers is is potassium sulfate bad for you? From a toxicological standpoint, potassium sulfate is classified as a low-hazard substance. The acute oral LD₅₀ (rat) is > 2,000 mg/kg, placing it in GHS Category 5 or unclassified. The ions themselves are ubiquitous in food and the human body: potassium is an essential electrolyte, and sulfate is a normal metabolite. Irritation may occur from high-concentration dust, but no chronic toxicity or carcinogenicity is associated with K₂SO₄. Occupational exposure limits (OEL) are commonly set at 10 mg/m³ for inhalable dust. Proper PPE – dust masks, goggles – is recommended during bulk handling. The ionic form remains stable and does not produce hazardous decomposition until extreme temperatures, where SOₓ fumes may evolve. Overall, when sourced from a reputable producer with rigorous quality control, potassium sulfate is safe for all intended uses.
Industrial contracts require clear specifications tied to the potassium and sulfate ion formula. Typical parameters include:
Analytical methods include ICP-OES for metals, ion chromatography for Cl⁻, and gravimetry for sulfate. As a potassium sulfate supplier with in-house QC labs, Hailei Chemical provides COA documentation with each shipment, adhering to ISO 9001 standards.
When evaluating where to buy potassium aluminum sulfate or potassium sulfate, consider the supply chain depth. Many distributors buy from China, the world’s largest producer of SOP. Direct sourcing from a manufacturer like Weifang Hailei Fine Chemical Co., Ltd. eliminates intermediaries, providing cost advantages and technical transparency. We offer:
For glass manufacturers needing low-iron grades or fertilizer importers seeking granular SOP, our team tailors specifications. Visit our potassium sulfate product page for standard data sheets, and request a quote to discuss your annual volume requirements.
Because the potassium and sulfate ion formula lacks hydrated water, the product is non-deliquescent and stores well in ambient conditions. However, moisture pickup can occur above 70% relative humidity. Best practices: store in dry warehouses, avoid direct contact with acidic materials, and use moisture-proof liners for bagged cargo. Compatibility with standard conveying equipment is excellent, and its non-combustible nature reduces insurance premiums.
Regulatory bodies worldwide recognize K₂SO₄ as a benign substance. It is exempt from many VOC and hazardous air pollutant listings. For fertilizer registration, it meets EU 2003/2003 and REACH exemptions. The sulfate ion, once applied to soil, undergoes microbial transformation to sulfide under anaerobic conditions, but in aerobic soils it remains stable, serving as a plant nutrient. No bioaccumulation risk exists. These factors give potassium and sulfate ion formula-based products a green profile in increasingly regulated markets.
The simplicity of the potassium and sulfate ion formula belies its versatile industrial strength. Whether you need a chloride-free potassium source for high-value crops, a refining agent for pristine glass, or a safe pharmaceutical excipient, the chemistry of K₂SO₄ delivers consistent results. As a premier potassium sulfate supplier, Weifang Hailei Fine Chemical Co., Ltd. stands ready to support your business with guaranteed purity, competitive pricing, and technical expertise. Get your personalized quotation today and let our quality make a formula for your success.
Every industrial raw material carries a chemical identity that determines its value, performance, and safety. For potassium sulfate, this identity is captured by the potassium and sulfate ion formula – K2SO4. While the formula appears simple, it unlocks insight into the product’s chlorine-free nature, high potassium oxide equivalent, sulfur availability, and compatibility with sensitive manufacturing processes. For procurement managers, understanding the formula’s implications directly supports quality assurance, logistics planning, and cost control, whether sourcing for specialty fertilizers, glass production, aluminum recycling, or pharmaceutical excipients. This article provides a technical deep dive into the potassium and sulfate ion formula, its relationship to commercial specifications, safety considerations, and supplier selection criteria, helping you make informed buying decisions backed by chemistry.
The potassium and sulfate ion formula is K2SO4. The compound consists of two potassium cations (K+) and one sulfate anion (SO42−), held together by strong ionic bonds in a crystalline lattice. This stoichiometry gives potassium sulfate a molar mass of 174.259 g/mol and a theoretical potassium oxide (K2O) content of 54.0%. In practice, commercial grades deliver a minimum of 50.0% K2O, with the balance being sulfate and trace impurities. When dissolved in water, K2SO4 fully dissociates into its constituent ions, releasing two moles of K+ and one mole of SO42− per mole of salt. This complete solubility is critical for applications ranging from fertigation solutions to homogeneous glass melts.
The sulfate ion itself is tetrahedral, with sulfur at the center bonded to four oxygen atoms. Its charge and geometry make it stable under high-temperature conditions, which explains why potassium sulfate is preferred in glass and aluminum fluxing where chlorides would volatilize or cause corrosion. The absence of chloride ions in the formula is a key differentiator from potassium chloride (KCl), making K2SO4 the go-to choice for chloride-sensitive crops, high-purity industrial processes, and pharmaceutical-grade materials.
A compound’s molecular formula directly dictates its reactivity, handling characteristics, and end-use performance. For potassium sulfate, the potassium and sulfate ion formula translates into several practical advantages that industrial buyers should evaluate.
In specialty agriculture, especially for high-value crops such as tobacco, citrus, grapes, and potatoes, chloride sensitivity demands a potassium source that won’t cause leaf burn or reduce yield quality. The K2SO4 formula guarantees zero chloride content. Moreover, the sulfate ion supplies plant-available sulfur, a secondary macronutrient essential for protein synthesis and enzyme activity. Typical commercial granular potassium sulfate contains 50–51% K2O (equivalent to 41–42.5% K) and 17–18% sulfur. Importers and blenders rely on this consistent chemistry to formulate NPK blends without compromising chloride limits. For more information on fertilizer-grade material, visit our potassium sulfate product page.
K2SO4 acts as a fining agent and a source of potassium oxide in specialty glass batches. Potassium ions help reduce the melt viscosity and improve the refractive index, while the sulfate ion aids in bubble removal by releasing sulfur gases at specific temperatures. Because the formula contains no halogens, it avoids the formation of volatile chlorides that cause surface defects or corrosion of furnace refractories. Glass manufacturers often specify potassium sulfate with a minimum K2O content of 50% and low heavy metal impurities, ensuring optical-quality transparency.
In secondary aluminum smelting, potassium sulfate is used as a component of salt fluxes to cleanse molten metal of oxides and inclusions. The sulfate part of the potassium and sulfate ion formula helps form a low-melting eutectic with other salts like sodium chloride, creating a protective cover and collecting dross. Crucially, K2SO4 is preferred over potassium chloride because sulfate fluxes generate less corrosive off-gases, improving workplace safety and extending equipment life. Technical specifications for this application demand a consistent crystal size distribution to ensure even melting and flux coverage.
Potassium sulfate is listed as a pharmaceutical excipient, where its formula guarantees a simple, well-characterized electrolyte salt. When used in tablet formulations or intravenous preparations, the ionic dissociation provides potassium without introducing chloride, which can be crucial for patients with renal impairment or chloride-sensitive conditions. Pharmaceutical-grade K2SO4 must meet stringent pharmacopoeia monographs (such as USP, EP) with assays typically >99% purity, heavy metals ≤5 ppm, and loss on drying ≤0.5%. The predictable identity of the potassium and sulfate ions ensures reliable bioavailability and compatibility with active pharmaceutical ingredients.
A thorough review of the potassium sulfate chemical profile goes beyond the molecular formula to include commercial assay data, typical impurities, and physical properties that affect handling and performance. Industrial buyers rely on these specifications to qualify suppliers and to avoid costly downstream issues.
Understanding the exact chemical profile helps distinguish between suppliers. At Weifang Hailei Fine Chemical Co., Ltd., we provide a detailed certificate of analysis with every shipment, verifying these parameters through accredited lab testing. For current COA examples or to request a sample, please contact us for a quote.
A common search query among first-time buyers and safety officers is: is potassium sulfate bad for you? The answer depends on form, exposure route, and application context. In general, K2SO4 is considered a low-toxicity chemical. It is not classified as a carcinogen, mutagen, or reproductive toxin under GHS. However, like any fine chemical dust, it can cause irritation. Here’s a breakdown:
Safety across the supply chain is a priority. Our potassium sulfate is packaged in 25 kg bags, 1000 kg super sacks, or bulk, with appropriate hazard labeling and SDS documentation. Proper storage in a cool, dry area away from strong acids will maintain product stability. Buyers should always request the latest Safety Data Sheet to ensure compliance with local regulations.
Industrial procurement questions often overlap. For buyers searching where to buy potassium aluminum sulfate—also known as potash alum—alongside potassium sulfate, it’s essential to find a potassium sulfate supplier that can offer a broad portfolio of potassium and sulfate-based chemicals. Weifang Hailei Fine Chemical supplies both potassium aluminum sulfate (AlK(SO4)2·12H2O) for water treatment, tanning, and food additives, and high-purity potassium sulfate for fertilizer, glass, and pharma. This integrated supply simplifies logistics, reduces the number of supplier audits, and often yields better freight consolidation.
When evaluating a potassium sulfate supplier, consider:
Hailei Chemical has over 15 years of export experience, partnering with buyers across Southeast Asia, the Middle East, Africa, and South America. We offer multiple packing options and tailored specifications. To start a conversation about your potassium sulfate requirements or to inquire about potassium aluminum sulfate, visit our product pages or use the quick quote form.
Understanding the potassium and sulfate ion formula is more than an academic exercise—it’s a tool for managing cost, quality, and risk. When you issue an RFQ, specifying K2O content, chloride limits, and particle size effectively communicates what the K2SO4 formula already tells you: you need a pure, chlorine-free potassium and sulfate source. By aligning your purchase order with well-defined chemical specifications, you avoid ambiguity and ensure the delivered product meets your process requirements. Whether you are blending high-value crop fertilizers, producing optical glass, or formulating pharmaceutical excipients, the formula is your first line of quality assurance.
We invite you to leverage our technical expertise and reliable supply chain. Request a competitive quote today for potassium sulfate or potassium aluminum sulfate tailored to your exact specifications. Our team will respond within 24 hours with a detailed offer, including COA, packing options, and freight estimates.
When sourcing industrial chemicals for aluminum recycling, glass manufacturing, or agricultural applications, procurement professionals often encounter safety data sheets (SDS) for compounds that appear similar but have distinct properties. One such compound is aluminum potassium sulfate (potassium alum), whose aluminum potassium sulfate SDS you may need to review for occupational safety. However, what you actually require for your operations might be potassium sulfate (K2SO4)—a versatile, chlorine-free potassium salt used widely as a specialty fertilizer, in high-end glass production, and as a flux in aluminum recycling. This article demystifies the aluminum potassium sulfate SDS, highlights the crucial differences from potassium sulfate, and explores the many benefits of buying high-purity potassium sulfate from a trusted supplier like Weifang Hailei Fine Chemical Co., Ltd.
Aluminum potassium sulfate, often called potassium alum, has the chemical formula KAl(SO4)2·12H2O. It is a double sulfate salt that crystallizes as white, odorless octahedra. Historically used in water purification, textile mordanting, baking powders, and even aftershave formulations, this compound is not interchangeable with the potassium sulfate (K2SO4) that fuels modern industries. For any chemical handler, the aluminum potassium sulfate SDS (Safety Data Sheet) is the primary document for hazard communication, outlining physical, health, and environmental risks along with safe handling practices. Industrial buyers who mistakenly search for an aluminum potassium sulfate SDS when they intend to purchase potassium sulfate for aluminum recycling or glass making can avoid costly errors by understanding these two chemicals’ profiles.
An SDS for aluminum potassium sulfate typically classifies the substance as a mild irritant to skin and eyes, with no significant acute toxicity. It is not classified as carcinogenic, mutagenic, or reprotoxic. However, fine dust may cause respiratory irritation. The sheet will detail appropriate personal protective equipment (PPE), including safety glasses and dust masks, and first-aid measures. Because potassium alum is water-soluble, the SDS also addresses spill containment and ecological notes, warning against release into waterways due to its alum content, which can acidify soil.
For procurement teams, understanding the structure of an aluminum potassium sulfate SDS ensures regulatory compliance and workplace safety. While specific details vary by manufacturer, a standard 16-section SDS follows the Globally Harmonized System (GHS). Here are the crucial sections every buyer should review:
Procurement professionals handling potassium alum must have this SDS on file. But if your operation actually focuses on aluminum recycling or high-end glass making, the chemical you need is not alum but potassium sulfate. Let’s clarify the differences.
One of the most common mix-ups in bulk chemical procurement occurs between potassium sulfate and aluminum potassium sulfate. The potassium sulfate formula is K2SO4, a neutral inorganic salt containing only potassium and sulfate ions. In contrast, the aluminum potassium sulfate formula is KAl(SO4)2, often hydrated with 12 water molecules, making it an acidic double sulfate. Table 1 summarizes the critical differences.
| Property | Potassium Sulfate (K2SO4) | Aluminum Potassium Sulfate (KAl(SO4)2·12H2O) |
|---|---|---|
| Common Name | Sulfate of potash (SOP) | Potassium alum, alum |
| CAS Number | 7778-80-5 | 7784-24-9 |
| Molecular Weight | 174.26 g/mol | 474.39 g/mol |
| pH (aqueous solution) | ~7 (neutral) | ~3–4 (acidic) |
| Chloride Content | Typically < 0.5% | Not applicable |
| Main Industrial Role | Chlorine-free potassium source for fertilizer, glass flux, aluminum recycling salt, pharmaceutical excipient | Water purification, dye mordant, baking powder, astringent |
| SDS Hazard Statements | Generally not hazardous; may cause slight respiratory irritation as dust | Irritant; acidic nature requires cautious handling |
This fundamental divergence in chemistry means that potassium sulfate is valued for its potassium nutrient content (minimum 50% K2O) and chlorine-free character, while aluminum potassium sulfate is chosen for its coagulating and acidic properties. The aluminum potassium sulfate SDS highlights its mild irritant potential, whereas the SDS for potassium sulfate typically emphasizes low hazard and safe use in food-grade and fertilizer applications.
Potassium sulfate, or SOP, commands a premium in global markets due to its purity and versatility. Below are the primary uses of potassium sulfate across key industries, demonstrating why it is the material of choice over misidentified alternatives like alum.
A common query from agricultural buyers is: what is potassium sulfate fertilizer? SOP is a high-potassium, low-chloride fertilizer providing essential potassium (K) and sulfur (S) to crops without the harmful chloride found in muriate of potash (KCl). With a guaranteed minimum 50% K2O and typically 18% sulfur, it is indispensable for chloride-sensitive crops including tobacco, potatoes, fruits, vegetables, and nuts. Potassium regulates osmosis, enzyme activation, and photosynthesis, while sulfur aids amino acid and protein formation. Because SOP does not increase soil salinity, it is ideal for arid regions and high-value protected cultivation like greenhouse tomatoes and melons.
Leading specialty fertilizer importers prefer granular potassium sulfate for direct application and water-soluble powder for fertigation and foliar sprays. The product’s uniformity and low insoluble content ensure compatibility with modern agricultural machinery.
High-quality glass—from television screens to optical lenses and crystal tableware—relies on potassium sulfate as a refining agent. Added in small percentages to the glass batch, it lowers the melting temperature and helps remove fine bubbles (glass fining). The potassium ion enhances glass brilliance and durability. Crucially, the absence of chloride in K2SO4 prevents the green tint and corrosion problems associated with sodium or potassium chloride-based fluxes. Glass manufacturers demanding superior clarity and chemical resistance routinely specify 99% minimum purity potassium sulfate, making Hailei Chemical a preferred partner with our consistent quality and comprehensive documentation.
The uses of potassium sulfate in aluminum recycling are often overlooked but are of growing importance. In secondary aluminum smelting, salt fluxes protect the molten metal from oxidation and absorb non-metallic impurities. While sodium chloride–potassium chloride mixtures are traditional, potassium sulfate is increasingly used as a component of salt flux to refine aluminum alloys—especially those destined for automotive and aerospace applications where chloride-induced corrosion is a risk. Potassium sulfate’s high melting point and fluxing action effectively cleanse the melt, improving metal recovery rates. This is where confusion with aluminum potassium sulfate arises: buyers seeking a flux for aluminum might search for “aluminum potassium sulfate” when they really need high-grade potassium sulfate. Obtaining the correct aluminum potassium sulfate SDS is important if you handle that compound, but for aluminum recycling flux, Hailei’s K2SO4 is the targeted solution.
Potassium sulfate serves as an excipient in pharmaceutical formulations, functioning as a source of potassium or as an inert filler. Its high purity (meeting USP/BP standards) makes it suitable for effervescent tablets and nutritional supplements. In gypsum board production, K2SO4 accelerates the setting of plaster of Paris, improving manufacturing efficiency. Additionally, potassium sulfate is the starting material for synthesizing various potassium chemicals, including potassium carbonate and potassium permanganate.
Some buyers also inquire about the uses of glucosamine sulfate potassium chloride. This compound is a dietary supplement ingredient used to support joint health. It consists of glucosamine sulfate stabilized with potassium chloride (or sometimes sodium chloride). While it contains potassium, it is chemically distinct from potassium sulfate and is not an industrial chemical. Pharmaceutical manufacturers producing glucosamine supplements may source raw potassium chloride separately, but they also occasionally need high-purity potassium sulfate for other preparations. So while the SDS for aluminum potassium sulfate and the specification for glucosamine sulfate potassium chloride address different supply chains, they all underscore the importance of precision in chemical procurement.
When procuring potassium sulfate for any of the above applications, the following quality parameters are non-negotiable. At Hailei Chemical’s potassium sulfate product page, you will find detailed specifications that meet or exceed international standards:
Beyond the certificate of analysis, evaluate your supplier on production capacity, logistics reliability, and regulatory compliance. Hailei Fine Chemical operates a modern production facility with strict ISO 9001 quality management, offers flexible packaging (25 kg bags, 1,000 kg supersacks, or customer-specified), and has deep experience shipping globally with all necessary documentation—including the correct SDS for the product shipped. For industrial buyers, having a supplier that understands the subtle but critical distinction between potassium sulfate and compounds such as aluminum potassium sulfate can save time, ensure the right chemical arrives, and maintain compliance at every port.
Q: Can I use aluminum potassium sulfate instead of potassium sulfate as a fertilizer?
No. Aluminum potassium sulfate is acidic and contains aluminum, which is toxic to most plants in soluble form. Only potassium sulfate (K2SO4) provides plant-available potassium safely.
Q: Where can I download an aluminum potassium sulfate SDS?
If you handle potassium alum for water treatment or other uses, your supplier must provide its SDS. Hailei Chemical’s core product is potassium sulfate; we supply the appropriate SDS for that material. Always ensure you are viewing the SDS for the exact CAS number you are handling.
Q: Is potassium sulfate hazardous?
Under typical handling conditions, potassium sulfate is classified as non-hazardous. Its SDS usually lists no signal word. However, fine dust may cause mechanical irritation, so standard dust masks and goggles are recommended.
Q: What is the price difference between potassium sulfate and muriate of potash (MOP)?
SOP commonly commands a 30–50% premium over MOP due to its manufacturing complexity and chlorine-free value. For chloride-sensitive crops and specialized industrial uses, the ROI justifies the cost.
Whether you need a reliable source of potassium sulfate for chlorine-free fertilization, high-transparency glass, or advanced aluminum recycling flux, Hailei Chemical delivers consistent quality with full documentation, including the correct SDS. Don’t let confusion between aluminum potassium sulfate and potassium sulfate disrupt your supply chain. Visit our dedicated potassium sulfate page to review full specifications, or request a competitive quote today. Our team is ready to answer your technical questions and provide samples to ensure the product meets your exact needs.
Every industrial raw material carries a chemical identity that determines its value, performance, and safety. For potassium sulfate, this identity is captured by the potassium and sulfate ion formula – K2SO4. While the formula appears simple, it unlocks insight into the product’s chlorine-free nature, high potassium oxide equivalent, sulfur availability, and compatibility with sensitive manufacturing processes. For procurement managers, understanding the formula’s implications directly supports quality assurance, logistics planning, and cost control, whether sourcing for specialty fertilizers, glass production, aluminum recycling, or pharmaceutical excipients. This article provides a technical deep dive into the potassium and sulfate ion formula, its relationship to commercial specifications, safety considerations, and supplier selection criteria, helping you make informed buying decisions backed by chemistry.
The potassium and sulfate ion formula is K2SO4. The compound consists of two potassium cations (K+) and one sulfate anion (SO42−), held together by strong ionic bonds in a crystalline lattice. This stoichiometry gives potassium sulfate a molar mass of 174.259 g/mol and a theoretical potassium oxide (K2O) content of 54.0%. In practice, commercial grades deliver a minimum of 50.0% K2O, with the balance being sulfate and trace impurities. When dissolved in water, K2SO4 fully dissociates into its constituent ions, releasing two moles of K+ and one mole of SO42− per mole of salt. This complete solubility is critical for applications ranging from fertigation solutions to homogeneous glass melts.
The sulfate ion itself is tetrahedral, with sulfur at the center bonded to four oxygen atoms. Its charge and geometry make it stable under high-temperature conditions, which explains why potassium sulfate is preferred in glass and aluminum fluxing where chlorides would volatilize or cause corrosion. The absence of chloride ions in the formula is a key differentiator from potassium chloride (KCl), making K2SO4 the go-to choice for chloride-sensitive crops, high-purity industrial processes, and pharmaceutical-grade materials.
A compound’s molecular formula directly dictates its reactivity, handling characteristics, and end-use performance. For potassium sulfate, the potassium and sulfate ion formula translates into several practical advantages that industrial buyers should evaluate.
In specialty agriculture, especially for high-value crops such as tobacco, citrus, grapes, and potatoes, chloride sensitivity demands a potassium source that won’t cause leaf burn or reduce yield quality. The K2SO4 formula guarantees zero chloride content. Moreover, the sulfate ion supplies plant-available sulfur, a secondary macronutrient essential for protein synthesis and enzyme activity. Typical commercial granular potassium sulfate contains 50–51% K2O (equivalent to 41–42.5% K) and 17–18% sulfur. Importers and blenders rely on this consistent chemistry to formulate NPK blends without compromising chloride limits. For more information on fertilizer-grade material, visit our potassium sulfate product page.
K2SO4 acts as a fining agent and a source of potassium oxide in specialty glass batches. Potassium ions help reduce the melt viscosity and improve the refractive index, while the sulfate ion aids in bubble removal by releasing sulfur gases at specific temperatures. Because the formula contains no halogens, it avoids the formation of volatile chlorides that cause surface defects or corrosion of furnace refractories. Glass manufacturers often specify potassium sulfate with a minimum K2O content of 50% and low heavy metal impurities, ensuring optical-quality transparency.
In secondary aluminum smelting, potassium sulfate is used as a component of salt fluxes to cleanse molten metal of oxides and inclusions. The sulfate part of the potassium and sulfate ion formula helps form a low-melting eutectic with other salts like sodium chloride, creating a protective cover and collecting dross. Crucially, K2SO4 is preferred over potassium chloride because sulfate fluxes generate less corrosive off-gases, improving workplace safety and extending equipment life. Technical specifications for this application demand a consistent crystal size distribution to ensure even melting and flux coverage.
Potassium sulfate is listed as a pharmaceutical excipient, where its formula guarantees a simple, well-characterized electrolyte salt. When used in tablet formulations or intravenous preparations, the ionic dissociation provides potassium without introducing chloride, which can be crucial for patients with renal impairment or chloride-sensitive conditions. Pharmaceutical-grade K2SO4 must meet stringent pharmacopoeia monographs (such as USP, EP) with assays typically >99% purity, heavy metals ≤5 ppm, and loss on drying ≤0.5%. The predictable identity of the potassium and sulfate ions ensures reliable bioavailability and compatibility with active pharmaceutical ingredients.
A thorough review of the potassium sulfate chemical profile goes beyond the molecular formula to include commercial assay data, typical impurities, and physical properties that affect handling and performance. Industrial buyers rely on these specifications to qualify suppliers and to avoid costly downstream issues.
Understanding the exact chemical profile helps distinguish between suppliers. At Weifang Hailei Fine Chemical Co., Ltd., we provide a detailed certificate of analysis with every shipment, verifying these parameters through accredited lab testing. For current COA examples or to request a sample, please contact us for a quote.
A common search query among first-time buyers and safety officers is: is potassium sulfate bad for you? The answer depends on form, exposure route, and application context. In general, K2SO4 is considered a low-toxicity chemical. It is not classified as a carcinogen, mutagen, or reproductive toxin under GHS. However, like any fine chemical dust, it can cause irritation. Here’s a breakdown:
Safety across the supply chain is a priority. Our potassium sulfate is packaged in 25 kg bags, 1000 kg super sacks, or bulk, with appropriate hazard labeling and SDS documentation. Proper storage in a cool, dry area away from strong acids will maintain product stability. Buyers should always request the latest Safety Data Sheet to ensure compliance with local regulations.
Industrial procurement questions often overlap. For buyers searching where to buy potassium aluminum sulfate—also known as potash alum—alongside potassium sulfate, it’s essential to find a potassium sulfate supplier that can offer a broad portfolio of potassium and sulfate-based chemicals. Weifang Hailei Fine Chemical supplies both potassium aluminum sulfate (AlK(SO4)2·12H2O) for water treatment, tanning, and food additives, and high-purity potassium sulfate for fertilizer, glass, and pharma. This integrated supply simplifies logistics, reduces the number of supplier audits, and often yields better freight consolidation.
When evaluating a potassium sulfate supplier, consider:
Hailei Chemical has over 15 years of export experience, partnering with buyers across Southeast Asia, the Middle East, Africa, and South America. We offer multiple packing options and tailored specifications. To start a conversation about your potassium sulfate requirements or to inquire about potassium aluminum sulfate, visit our product pages or use the quick quote form.
Understanding the potassium and sulfate ion formula is more than an academic exercise—it’s a tool for managing cost, quality, and risk. When you issue an RFQ, specifying K2O content, chloride limits, and particle size effectively communicates what the K2SO4 formula already tells you: you need a pure, chlorine-free potassium and sulfate source. By aligning your purchase order with well-defined chemical specifications, you avoid ambiguity and ensure the delivered product meets your process requirements. Whether you are blending high-value crop fertilizers, producing optical glass, or formulating pharmaceutical excipients, the formula is your first line of quality assurance.
We invite you to leverage our technical expertise and reliable supply chain. Request a competitive quote today for potassium sulfate or potassium aluminum sulfate tailored to your exact specifications. Our team will respond within 24 hours with a detailed offer, including COA, packing options, and freight estimates.
When sourcing industrial chemicals for aluminum recycling, glass manufacturing, or agricultural applications, procurement professionals often encounter safety data sheets (SDS) for compounds that appear similar but have distinct properties. One such compound is aluminum potassium sulfate (potassium alum), whose aluminum potassium sulfate SDS you may need to review for occupational safety. However, what you actually require for your operations might be potassium sulfate (K2SO4)—a versatile, chlorine-free potassium salt used widely as a specialty fertilizer, in high-end glass production, and as a flux in aluminum recycling. This article demystifies the aluminum potassium sulfate SDS, highlights the crucial differences from potassium sulfate, and explores the many benefits of buying high-purity potassium sulfate from a trusted supplier like Weifang Hailei Fine Chemical Co., Ltd.
Aluminum potassium sulfate, often called potassium alum, has the chemical formula KAl(SO4)2·12H2O. It is a double sulfate salt that crystallizes as white, odorless octahedra. Historically used in water purification, textile mordanting, baking powders, and even aftershave formulations, this compound is not interchangeable with the potassium sulfate (K2SO4) that fuels modern industries. For any chemical handler, the aluminum potassium sulfate SDS (Safety Data Sheet) is the primary document for hazard communication, outlining physical, health, and environmental risks along with safe handling practices. Industrial buyers who mistakenly search for an aluminum potassium sulfate SDS when they intend to purchase potassium sulfate for aluminum recycling or glass making can avoid costly errors by understanding these two chemicals’ profiles.
An SDS for aluminum potassium sulfate typically classifies the substance as a mild irritant to skin and eyes, with no significant acute toxicity. It is not classified as carcinogenic, mutagenic, or reprotoxic. However, fine dust may cause respiratory irritation. The sheet will detail appropriate personal protective equipment (PPE), including safety glasses and dust masks, and first-aid measures. Because potassium alum is water-soluble, the SDS also addresses spill containment and ecological notes, warning against release into waterways due to its alum content, which can acidify soil.
For procurement teams, understanding the structure of an aluminum potassium sulfate SDS ensures regulatory compliance and workplace safety. While specific details vary by manufacturer, a standard 16-section SDS follows the Globally Harmonized System (GHS). Here are the crucial sections every buyer should review:
Procurement professionals handling potassium alum must have this SDS on file. But if your operation actually focuses on aluminum recycling or high-end glass making, the chemical you need is not alum but potassium sulfate. Let’s clarify the differences.
One of the most common mix-ups in bulk chemical procurement occurs between potassium sulfate and aluminum potassium sulfate. The potassium sulfate formula is K2SO4, a neutral inorganic salt containing only potassium and sulfate ions. In contrast, the aluminum potassium sulfate formula is KAl(SO4)2, often hydrated with 12 water molecules, making it an acidic double sulfate. Table 1 summarizes the critical differences.
| Property | Potassium Sulfate (K2SO4) | Aluminum Potassium Sulfate (KAl(SO4)2·12H2O) |
|---|---|---|
| Common Name | Sulfate of potash (SOP) | Potassium alum, alum |
| CAS Number | 7778-80-5 | 7784-24-9 |
| Molecular Weight | 174.26 g/mol | 474.39 g/mol |
| pH (aqueous solution) | ~7 (neutral) | ~3–4 (acidic) |
| Chloride Content | Typically < 0.5% | Not applicable |
| Main Industrial Role | Chlorine-free potassium source for fertilizer, glass flux, aluminum recycling salt, pharmaceutical excipient | Water purification, dye mordant, baking powder, astringent |
| SDS Hazard Statements | Generally not hazardous; may cause slight respiratory irritation as dust | Irritant; acidic nature requires cautious handling |
This fundamental divergence in chemistry means that potassium sulfate is valued for its potassium nutrient content (minimum 50% K2O) and chlorine-free character, while aluminum potassium sulfate is chosen for its coagulating and acidic properties. The aluminum potassium sulfate SDS highlights its mild irritant potential, whereas the SDS for potassium sulfate typically emphasizes low hazard and safe use in food-grade and fertilizer applications.
Potassium sulfate, or SOP, commands a premium in global markets due to its purity and versatility. Below are the primary uses of potassium sulfate across key industries, demonstrating why it is the material of choice over misidentified alternatives like alum.
A common query from agricultural buyers is: what is potassium sulfate fertilizer? SOP is a high-potassium, low-chloride fertilizer providing essential potassium (K) and sulfur (S) to crops without the harmful chloride found in muriate of potash (KCl). With a guaranteed minimum 50% K2O and typically 18% sulfur, it is indispensable for chloride-sensitive crops including tobacco, potatoes, fruits, vegetables, and nuts. Potassium regulates osmosis, enzyme activation, and photosynthesis, while sulfur aids amino acid and protein formation. Because SOP does not increase soil salinity, it is ideal for arid regions and high-value protected cultivation like greenhouse tomatoes and melons.
Leading specialty fertilizer importers prefer granular potassium sulfate for direct application and water-soluble powder for fertigation and foliar sprays. The product’s uniformity and low insoluble content ensure compatibility with modern agricultural machinery.
High-quality glass—from television screens to optical lenses and crystal tableware—relies on potassium sulfate as a refining agent. Added in small percentages to the glass batch, it lowers the melting temperature and helps remove fine bubbles (glass fining). The potassium ion enhances glass brilliance and durability. Crucially, the absence of chloride in K2SO4 prevents the green tint and corrosion problems associated with sodium or potassium chloride-based fluxes. Glass manufacturers demanding superior clarity and chemical resistance routinely specify 99% minimum purity potassium sulfate, making Hailei Chemical a preferred partner with our consistent quality and comprehensive documentation.
The uses of potassium sulfate in aluminum recycling are often overlooked but are of growing importance. In secondary aluminum smelting, salt fluxes protect the molten metal from oxidation and absorb non-metallic impurities. While sodium chloride–potassium chloride mixtures are traditional, potassium sulfate is increasingly used as a component of salt flux to refine aluminum alloys—especially those destined for automotive and aerospace applications where chloride-induced corrosion is a risk. Potassium sulfate’s high melting point and fluxing action effectively cleanse the melt, improving metal recovery rates. This is where confusion with aluminum potassium sulfate arises: buyers seeking a flux for aluminum might search for “aluminum potassium sulfate” when they really need high-grade potassium sulfate. Obtaining the correct aluminum potassium sulfate SDS is important if you handle that compound, but for aluminum recycling flux, Hailei’s K2SO4 is the targeted solution.
Potassium sulfate serves as an excipient in pharmaceutical formulations, functioning as a source of potassium or as an inert filler. Its high purity (meeting USP/BP standards) makes it suitable for effervescent tablets and nutritional supplements. In gypsum board production, K2SO4 accelerates the setting of plaster of Paris, improving manufacturing efficiency. Additionally, potassium sulfate is the starting material for synthesizing various potassium chemicals, including potassium carbonate and potassium permanganate.
Some buyers also inquire about the uses of glucosamine sulfate potassium chloride. This compound is a dietary supplement ingredient used to support joint health. It consists of glucosamine sulfate stabilized with potassium chloride (or sometimes sodium chloride). While it contains potassium, it is chemically distinct from potassium sulfate and is not an industrial chemical. Pharmaceutical manufacturers producing glucosamine supplements may source raw potassium chloride separately, but they also occasionally need high-purity potassium sulfate for other preparations. So while the SDS for aluminum potassium sulfate and the specification for glucosamine sulfate potassium chloride address different supply chains, they all underscore the importance of precision in chemical procurement.
When procuring potassium sulfate for any of the above applications, the following quality parameters are non-negotiable. At Hailei Chemical’s potassium sulfate product page, you will find detailed specifications that meet or exceed international standards:
Beyond the certificate of analysis, evaluate your supplier on production capacity, logistics reliability, and regulatory compliance. Hailei Fine Chemical operates a modern production facility with strict ISO 9001 quality management, offers flexible packaging (25 kg bags, 1,000 kg supersacks, or customer-specified), and has deep experience shipping globally with all necessary documentation—including the correct SDS for the product shipped. For industrial buyers, having a supplier that understands the subtle but critical distinction between potassium sulfate and compounds such as aluminum potassium sulfate can save time, ensure the right chemical arrives, and maintain compliance at every port.
Q: Can I use aluminum potassium sulfate instead of potassium sulfate as a fertilizer?
No. Aluminum potassium sulfate is acidic and contains aluminum, which is toxic to most plants in soluble form. Only potassium sulfate (K2SO4) provides plant-available potassium safely.
Q: Where can I download an aluminum potassium sulfate SDS?
If you handle potassium alum for water treatment or other uses, your supplier must provide its SDS. Hailei Chemical’s core product is potassium sulfate; we supply the appropriate SDS for that material. Always ensure you are viewing the SDS for the exact CAS number you are handling.
Q: Is potassium sulfate hazardous?
Under typical handling conditions, potassium sulfate is classified as non-hazardous. Its SDS usually lists no signal word. However, fine dust may cause mechanical irritation, so standard dust masks and goggles are recommended.
Q: What is the price difference between potassium sulfate and muriate of potash (MOP)?
SOP commonly commands a 30–50% premium over MOP due to its manufacturing complexity and chlorine-free value. For chloride-sensitive crops and specialized industrial uses, the ROI justifies the cost.
Whether you need a reliable source of potassium sulfate for chlorine-free fertilization, high-transparency glass, or advanced aluminum recycling flux, Hailei Chemical delivers consistent quality with full documentation, including the correct SDS. Don’t let confusion between aluminum potassium sulfate and potassium sulfate disrupt your supply chain. Visit our dedicated potassium sulfate page to review full specifications, or request a competitive quote today. Our team is ready to answer your technical questions and provide samples to ensure the product meets your exact needs.
Every industrial raw material carries a chemical identity that determines its value, performance, and safety. For potassium sulfate, this identity is captured by the potassium and sulfate ion formula – K2SO4. While the formula appears simple, it unlocks insight into the product’s chlorine-free nature, high potassium oxide equivalent, sulfur availability, and compatibility with sensitive manufacturing processes. For procurement managers, understanding the formula’s implications directly supports quality assurance, logistics planning, and cost control, whether sourcing for specialty fertilizers, glass production, aluminum recycling, or pharmaceutical excipients. This article provides a technical deep dive into the potassium and sulfate ion formula, its relationship to commercial specifications, safety considerations, and supplier selection criteria, helping you make informed buying decisions backed by chemistry.
The potassium and sulfate ion formula is K2SO4. The compound consists of two potassium cations (K+) and one sulfate anion (SO42−), held together by strong ionic bonds in a crystalline lattice. This stoichiometry gives potassium sulfate a molar mass of 174.259 g/mol and a theoretical potassium oxide (K2O) content of 54.0%. In practice, commercial grades deliver a minimum of 50.0% K2O, with the balance being sulfate and trace impurities. When dissolved in water, K2SO4 fully dissociates into its constituent ions, releasing two moles of K+ and one mole of SO42− per mole of salt. This complete solubility is critical for applications ranging from fertigation solutions to homogeneous glass melts.
The sulfate ion itself is tetrahedral, with sulfur at the center bonded to four oxygen atoms. Its charge and geometry make it stable under high-temperature conditions, which explains why potassium sulfate is preferred in glass and aluminum fluxing where chlorides would volatilize or cause corrosion. The absence of chloride ions in the formula is a key differentiator from potassium chloride (KCl), making K2SO4 the go-to choice for chloride-sensitive crops, high-purity industrial processes, and pharmaceutical-grade materials.
A compound’s molecular formula directly dictates its reactivity, handling characteristics, and end-use performance. For potassium sulfate, the potassium and sulfate ion formula translates into several practical advantages that industrial buyers should evaluate.
In specialty agriculture, especially for high-value crops such as tobacco, citrus, grapes, and potatoes, chloride sensitivity demands a potassium source that won’t cause leaf burn or reduce yield quality. The K2SO4 formula guarantees zero chloride content. Moreover, the sulfate ion supplies plant-available sulfur, a secondary macronutrient essential for protein synthesis and enzyme activity. Typical commercial granular potassium sulfate contains 50–51% K2O (equivalent to 41–42.5% K) and 17–18% sulfur. Importers and blenders rely on this consistent chemistry to formulate NPK blends without compromising chloride limits. For more information on fertilizer-grade material, visit our potassium sulfate product page.
K2SO4 acts as a fining agent and a source of potassium oxide in specialty glass batches. Potassium ions help reduce the melt viscosity and improve the refractive index, while the sulfate ion aids in bubble removal by releasing sulfur gases at specific temperatures. Because the formula contains no halogens, it avoids the formation of volatile chlorides that cause surface defects or corrosion of furnace refractories. Glass manufacturers often specify potassium sulfate with a minimum K2O content of 50% and low heavy metal impurities, ensuring optical-quality transparency.
In secondary aluminum smelting, potassium sulfate is used as a component of salt fluxes to cleanse molten metal of oxides and inclusions. The sulfate part of the potassium and sulfate ion formula helps form a low-melting eutectic with other salts like sodium chloride, creating a protective cover and collecting dross. Crucially, K2SO4 is preferred over potassium chloride because sulfate fluxes generate less corrosive off-gases, improving workplace safety and extending equipment life. Technical specifications for this application demand a consistent crystal size distribution to ensure even melting and flux coverage.
Potassium sulfate is listed as a pharmaceutical excipient, where its formula guarantees a simple, well-characterized electrolyte salt. When used in tablet formulations or intravenous preparations, the ionic dissociation provides potassium without introducing chloride, which can be crucial for patients with renal impairment or chloride-sensitive conditions. Pharmaceutical-grade K2SO4 must meet stringent pharmacopoeia monographs (such as USP, EP) with assays typically >99% purity, heavy metals ≤5 ppm, and loss on drying ≤0.5%. The predictable identity of the potassium and sulfate ions ensures reliable bioavailability and compatibility with active pharmaceutical ingredients.
A thorough review of the potassium sulfate chemical profile goes beyond the molecular formula to include commercial assay data, typical impurities, and physical properties that affect handling and performance. Industrial buyers rely on these specifications to qualify suppliers and to avoid costly downstream issues.
Understanding the exact chemical profile helps distinguish between suppliers. At Weifang Hailei Fine Chemical Co., Ltd., we provide a detailed certificate of analysis with every shipment, verifying these parameters through accredited lab testing. For current COA examples or to request a sample, please contact us for a quote.
A common search query among first-time buyers and safety officers is: is potassium sulfate bad for you? The answer depends on form, exposure route, and application context. In general, K2SO4 is considered a low-toxicity chemical. It is not classified as a carcinogen, mutagen, or reproductive toxin under GHS. However, like any fine chemical dust, it can cause irritation. Here’s a breakdown:
Safety across the supply chain is a priority. Our potassium sulfate is packaged in 25 kg bags, 1000 kg super sacks, or bulk, with appropriate hazard labeling and SDS documentation. Proper storage in a cool, dry area away from strong acids will maintain product stability. Buyers should always request the latest Safety Data Sheet to ensure compliance with local regulations.
Industrial procurement questions often overlap. For buyers searching where to buy potassium aluminum sulfate—also known as potash alum—alongside potassium sulfate, it’s essential to find a potassium sulfate supplier that can offer a broad portfolio of potassium and sulfate-based chemicals. Weifang Hailei Fine Chemical supplies both potassium aluminum sulfate (AlK(SO4)2·12H2O) for water treatment, tanning, and food additives, and high-purity potassium sulfate for fertilizer, glass, and pharma. This integrated supply simplifies logistics, reduces the number of supplier audits, and often yields better freight consolidation.
When evaluating a potassium sulfate supplier, consider:
Hailei Chemical has over 15 years of export experience, partnering with buyers across Southeast Asia, the Middle East, Africa, and South America. We offer multiple packing options and tailored specifications. To start a conversation about your potassium sulfate requirements or to inquire about potassium aluminum sulfate, visit our product pages or use the quick quote form.
Understanding the potassium and sulfate ion formula is more than an academic exercise—it’s a tool for managing cost, quality, and risk. When you issue an RFQ, specifying K2O content, chloride limits, and particle size effectively communicates what the K2SO4 formula already tells you: you need a pure, chlorine-free potassium and sulfate source. By aligning your purchase order with well-defined chemical specifications, you avoid ambiguity and ensure the delivered product meets your process requirements. Whether you are blending high-value crop fertilizers, producing optical glass, or formulating pharmaceutical excipients, the formula is your first line of quality assurance.
We invite you to leverage our technical expertise and reliable supply chain. Request a competitive quote today for potassium sulfate or potassium aluminum sulfate tailored to your exact specifications. Our team will respond within 24 hours with a detailed offer, including COA, packing options, and freight estimates.
When sourcing industrial chemicals for aluminum recycling, glass manufacturing, or agricultural applications, procurement professionals often encounter safety data sheets (SDS) for compounds that appear similar but have distinct properties. One such compound is aluminum potassium sulfate (potassium alum), whose aluminum potassium sulfate SDS you may need to review for occupational safety. However, what you actually require for your operations might be potassium sulfate (K2SO4)—a versatile, chlorine-free potassium salt used widely as a specialty fertilizer, in high-end glass production, and as a flux in aluminum recycling. This article demystifies the aluminum potassium sulfate SDS, highlights the crucial differences from potassium sulfate, and explores the many benefits of buying high-purity potassium sulfate from a trusted supplier like Weifang Hailei Fine Chemical Co., Ltd.
Aluminum potassium sulfate, often called potassium alum, has the chemical formula KAl(SO4)2·12H2O. It is a double sulfate salt that crystallizes as white, odorless octahedra. Historically used in water purification, textile mordanting, baking powders, and even aftershave formulations, this compound is not interchangeable with the potassium sulfate (K2SO4) that fuels modern industries. For any chemical handler, the aluminum potassium sulfate SDS (Safety Data Sheet) is the primary document for hazard communication, outlining physical, health, and environmental risks along with safe handling practices. Industrial buyers who mistakenly search for an aluminum potassium sulfate SDS when they intend to purchase potassium sulfate for aluminum recycling or glass making can avoid costly errors by understanding these two chemicals’ profiles.
An SDS for aluminum potassium sulfate typically classifies the substance as a mild irritant to skin and eyes, with no significant acute toxicity. It is not classified as carcinogenic, mutagenic, or reprotoxic. However, fine dust may cause respiratory irritation. The sheet will detail appropriate personal protective equipment (PPE), including safety glasses and dust masks, and first-aid measures. Because potassium alum is water-soluble, the SDS also addresses spill containment and ecological notes, warning against release into waterways due to its alum content, which can acidify soil.
For procurement teams, understanding the structure of an aluminum potassium sulfate SDS ensures regulatory compliance and workplace safety. While specific details vary by manufacturer, a standard 16-section SDS follows the Globally Harmonized System (GHS). Here are the crucial sections every buyer should review:
Procurement professionals handling potassium alum must have this SDS on file. But if your operation actually focuses on aluminum recycling or high-end glass making, the chemical you need is not alum but potassium sulfate. Let’s clarify the differences.
One of the most common mix-ups in bulk chemical procurement occurs between potassium sulfate and aluminum potassium sulfate. The potassium sulfate formula is K2SO4, a neutral inorganic salt containing only potassium and sulfate ions. In contrast, the aluminum potassium sulfate formula is KAl(SO4)2, often hydrated with 12 water molecules, making it an acidic double sulfate. Table 1 summarizes the critical differences.
| Property | Potassium Sulfate (K2SO4) | Aluminum Potassium Sulfate (KAl(SO4)2·12H2O) |
|---|---|---|
| Common Name | Sulfate of potash (SOP) | Potassium alum, alum |
| CAS Number | 7778-80-5 | 7784-24-9 |
| Molecular Weight | 174.26 g/mol | 474.39 g/mol |
| pH (aqueous solution) | ~7 (neutral) | ~3–4 (acidic) |
| Chloride Content | Typically < 0.5% | Not applicable |
| Main Industrial Role | Chlorine-free potassium source for fertilizer, glass flux, aluminum recycling salt, pharmaceutical excipient | Water purification, dye mordant, baking powder, astringent |
| SDS Hazard Statements | Generally not hazardous; may cause slight respiratory irritation as dust | Irritant; acidic nature requires cautious handling |
This fundamental divergence in chemistry means that potassium sulfate is valued for its potassium nutrient content (minimum 50% K2O) and chlorine-free character, while aluminum potassium sulfate is chosen for its coagulating and acidic properties. The aluminum potassium sulfate SDS highlights its mild irritant potential, whereas the SDS for potassium sulfate typically emphasizes low hazard and safe use in food-grade and fertilizer applications.
Potassium sulfate, or SOP, commands a premium in global markets due to its purity and versatility. Below are the primary uses of potassium sulfate across key industries, demonstrating why it is the material of choice over misidentified alternatives like alum.
A common query from agricultural buyers is: what is potassium sulfate fertilizer? SOP is a high-potassium, low-chloride fertilizer providing essential potassium (K) and sulfur (S) to crops without the harmful chloride found in muriate of potash (KCl). With a guaranteed minimum 50% K2O and typically 18% sulfur, it is indispensable for chloride-sensitive crops including tobacco, potatoes, fruits, vegetables, and nuts. Potassium regulates osmosis, enzyme activation, and photosynthesis, while sulfur aids amino acid and protein formation. Because SOP does not increase soil salinity, it is ideal for arid regions and high-value protected cultivation like greenhouse tomatoes and melons.
Leading specialty fertilizer importers prefer granular potassium sulfate for direct application and water-soluble powder for fertigation and foliar sprays. The product’s uniformity and low insoluble content ensure compatibility with modern agricultural machinery.
High-quality glass—from television screens to optical lenses and crystal tableware—relies on potassium sulfate as a refining agent. Added in small percentages to the glass batch, it lowers the melting temperature and helps remove fine bubbles (glass fining). The potassium ion enhances glass brilliance and durability. Crucially, the absence of chloride in K2SO4 prevents the green tint and corrosion problems associated with sodium or potassium chloride-based fluxes. Glass manufacturers demanding superior clarity and chemical resistance routinely specify 99% minimum purity potassium sulfate, making Hailei Chemical a preferred partner with our consistent quality and comprehensive documentation.
The uses of potassium sulfate in aluminum recycling are often overlooked but are of growing importance. In secondary aluminum smelting, salt fluxes protect the molten metal from oxidation and absorb non-metallic impurities. While sodium chloride–potassium chloride mixtures are traditional, potassium sulfate is increasingly used as a component of salt flux to refine aluminum alloys—especially those destined for automotive and aerospace applications where chloride-induced corrosion is a risk. Potassium sulfate’s high melting point and fluxing action effectively cleanse the melt, improving metal recovery rates. This is where confusion with aluminum potassium sulfate arises: buyers seeking a flux for aluminum might search for “aluminum potassium sulfate” when they really need high-grade potassium sulfate. Obtaining the correct aluminum potassium sulfate SDS is important if you handle that compound, but for aluminum recycling flux, Hailei’s K2SO4 is the targeted solution.
Potassium sulfate serves as an excipient in pharmaceutical formulations, functioning as a source of potassium or as an inert filler. Its high purity (meeting USP/BP standards) makes it suitable for effervescent tablets and nutritional supplements. In gypsum board production, K2SO4 accelerates the setting of plaster of Paris, improving manufacturing efficiency. Additionally, potassium sulfate is the starting material for synthesizing various potassium chemicals, including potassium carbonate and potassium permanganate.
Some buyers also inquire about the uses of glucosamine sulfate potassium chloride. This compound is a dietary supplement ingredient used to support joint health. It consists of glucosamine sulfate stabilized with potassium chloride (or sometimes sodium chloride). While it contains potassium, it is chemically distinct from potassium sulfate and is not an industrial chemical. Pharmaceutical manufacturers producing glucosamine supplements may source raw potassium chloride separately, but they also occasionally need high-purity potassium sulfate for other preparations. So while the SDS for aluminum potassium sulfate and the specification for glucosamine sulfate potassium chloride address different supply chains, they all underscore the importance of precision in chemical procurement.
When procuring potassium sulfate for any of the above applications, the following quality parameters are non-negotiable. At Hailei Chemical’s potassium sulfate product page, you will find detailed specifications that meet or exceed international standards:
Beyond the certificate of analysis, evaluate your supplier on production capacity, logistics reliability, and regulatory compliance. Hailei Fine Chemical operates a modern production facility with strict ISO 9001 quality management, offers flexible packaging (25 kg bags, 1,000 kg supersacks, or customer-specified), and has deep experience shipping globally with all necessary documentation—including the correct SDS for the product shipped. For industrial buyers, having a supplier that understands the subtle but critical distinction between potassium sulfate and compounds such as aluminum potassium sulfate can save time, ensure the right chemical arrives, and maintain compliance at every port.
Q: Can I use aluminum potassium sulfate instead of potassium sulfate as a fertilizer?
No. Aluminum potassium sulfate is acidic and contains aluminum, which is toxic to most plants in soluble form. Only potassium sulfate (K2SO4) provides plant-available potassium safely.
Q: Where can I download an aluminum potassium sulfate SDS?
If you handle potassium alum for water treatment or other uses, your supplier must provide its SDS. Hailei Chemical’s core product is potassium sulfate; we supply the appropriate SDS for that material. Always ensure you are viewing the SDS for the exact CAS number you are handling.
Q: Is potassium sulfate hazardous?
Under typical handling conditions, potassium sulfate is classified as non-hazardous. Its SDS usually lists no signal word. However, fine dust may cause mechanical irritation, so standard dust masks and goggles are recommended.
Q: What is the price difference between potassium sulfate and muriate of potash (MOP)?
SOP commonly commands a 30–50% premium over MOP due to its manufacturing complexity and chlorine-free value. For chloride-sensitive crops and specialized industrial uses, the ROI justifies the cost.
Whether you need a reliable source of potassium sulfate for chlorine-free fertilization, high-transparency glass, or advanced aluminum recycling flux, Hailei Chemical delivers consistent quality with full documentation, including the correct SDS. Don’t let confusion between aluminum potassium sulfate and potassium sulfate disrupt your supply chain. Visit our dedicated potassium sulfate page to review full specifications, or request a competitive quote today. Our team is ready to answer your technical questions and provide samples to ensure the product meets your exact needs.
For procurement managers, chemical engineers, and industrial buyers, the chemical formula potassium sulfate is far more than a basic molecular notation. It is the foundation for evaluating material purity, calculating nutrient content in fertilizers, specifying raw materials for glass and pharmaceutical production, and comparing costs between suppliers. At Hailei Chemicals, we witness daily how a deep understanding of K2SO4 composition helps buyers make smarter purchasing decisions, avoid costly contamination, and secure the exact industrial grade their process demands.
This comprehensive guide explores the molecular specifics of potassium sulfate, its chemical identity as a salt, the role its formula plays in quality control, and how to choose the right specification for your application. Whether you source sulfate of potash for chloride-sensitive crops, high-purity glass batches, or aluminum recycling fluxes, knowing the chemistry behind the product will sharpen your procurement edge.
The chemical formula potassium sulfate is K2SO4. This inorganic salt consists of two potassium cations (K+) for every sulfate anion (SO42−), forming a neutral ionic lattice. The molar mass is 174.259 g/mol, a figure frequently used in stoichiometric calculations for industrial blending.
Understanding the formula reveals three essential benchmarks for B2B buyers:
For suppliers like Hailei Chemicals, the formula informs every quality specification we declare on a Certificate of Analysis (COA). Variations in potassium oxide assay, water-soluble K2O percentage, and trace chloride content all trace back to how closely the material aligns with pure K2SO4.
Fertilizer buyers and agronomists often express potassium content as “K2O equivalent,” which can cause confusion if the raw chemical formula is not understood. The conversion factor from K to K2O is 1.2051, and from K2SO4 to K2O it’s 0.541. In other words, pure potassium sulfate yields 54.1% K2O. Most industrial grades, however, deliver between 50% and 52% K2O because of small amounts of sulfate salts of magnesium, calcium, or sodium remaining from the manufacturing process.
When comparing supplier quotations, always check whether the K2O figure refers to total or water-soluble potassium oxide—agronomic effectiveness depends on solubility, and water-soluble K2O is the relevant metric for drip irrigation and foliar feeds. Hailei Chemicals’ standard fine crystalline grade guarantees a minimum 50% water-soluble K2O, ensuring full nutrient availability.
Yes, is potassium sulphate a salt—and the chemistry is unambiguous. Potassium sulfate is a neutral ionic salt formed by the complete neutralization of sulfuric acid with potassium hydroxide or potassium carbonate. Its crystalline structure and high melting point (1,069°C) make it thermally stable, a valuable property in glass furnaces and aluminum fluxes where volatile chlorides would be unacceptable.
This salt classification has practical implications for logistics and storage. Potassium sulfate is hygroscopic in certain forms, particularly fine powder grades, so adequate packaging and dry storage prevent caking. Buyers should discuss moisture-proof packaging options, especially for ocean freight to humid regions. For a deeper comparison with other potassium salts, see the section below on formula-based differences.
Not all potassium sulfate is created equal. The chemical formula remains the same, but the purity—expressed as K2SO4 percentage—varies by process and post-treatment. B2B buyers encounter several common grades:
For procurement teams, matching the grade to the process is essential. An agricultural buyer overpaying for an optical grade absorbs unnecessary cost, while a glass manufacturer using fertilizer-grade powder risks iron contamination and off-color products. Always request a detailed COA and compare against your internal specification threshold.
Many producers use “potash” as a generic term, but potash vs potassium sulfate is a distinction rooted in chemical composition. Broadly, potash refers to potassium salts—most commonly potassium chloride (KCl, muriate of potash, MOP) and potassium sulfate (sulfate of potash, SOP).
| Property | Potassium Chloride (MOP) | Potassium Sulfate (SOP) |
|---|---|---|
| Chemical formula | KCl | K2SO4 |
| K2O content | 60-62% | 50-54% |
| Chloride (Cl) content | 45-47% | < 0.5% (often < 0.1%) |
| Sulfur (S) content | None | ~18% |
| Crop suitability | Chloride-tolerant crops (wheat, corn, barley) | Chloride-sensitive/high-value crops |
| Industrial use | Limited due to high chloride | Glass, aluminum flux, pharma, gypsum board |
The absence of chloride in SOP’s formula opens entirely different market segments. For fertilizer importers in regions like Pakistan, Morocco, or Egypt, where high-value fruit and vegetable production dominates, SOP is the preferred potassium source. The higher price per unit of K2O is offset by superior crop quality and zero chloride toxicity risk.
A trustworthy supplier will provide analytical data, but smart buyers know which tests align with the chemical formula potassium sulfate’s strict identity. When evaluating a shipment of sulfate of potash from China, consider requesting the following analyses:
Hailei Chemicals supplies every shipment with a comprehensive COA issued by CNAS-accredited labs, including potassium oxide percentage, moisture, chloride, and heavy metal trace levels. We encourage buyers to cross-verify these values with independent third-party testing on pre-shipment samples.
The question what is potassium sulfate used for has multiple answers depending on the grade. Here are the key industrial applications directly linked to the chemical formula and its properties:
Pakistan is one of the world’s largest importers of potassium sulfate for its citrus, potato, and tobacco sectors. When buyers search for potassium sulfate price in Pakistan, they are usually comparing CFR Karachi or Port Qasim quotations against landed domestic alternatives. Several formula-related factors influence pricing:
In 2025, CFR Pakistan quotes for granular SOP with minimum 50% K2O typically range between USD $560–$630 per metric ton depending on volume, origin, and shipment timing. As a large exporter with own Mannheim facility and integrated logistics, Hailei Chemicals works with Pakistani importers to optimize container loading and offer competitive CFR terms.
When sourcing potassium sulfate, the chemical formula is your first truth point, but a reliable supplier partnership requires additional verification. Here is a practical checklist for B2B procurement teams:
At Hailei Chemicals, we build our reputation on transparent specifications and batch-level traceability. We encourage buyers to compare our product data sheet with competitors and to request a sample before making a purchasing commitment.
Every formula unit of potassium sulfate carries specific weight and properties. Misunderstanding the composition can lead to overpayment, process inefficiencies, or even batch failure. For example, a glass manufacturer who accepts fertilizer-grade SOP with 20 ppm iron may find their final product tinted and unsellable. Conversely, an agricultural buyer paying for pharmaceutical-grade material wastes capital that could be better allocated elsewhere.
By mastering the K2SO4 formula and the language of purity, you gain:
Partnering with an ISO-certified manufacturer like Hailei Chemicals ensures that the material you receive matches the chemical formula on paper—batch after batch. Our dedicated export team handles everything from specification alignment to safe ocean freight, so you can focus on growing your markets.
For a customized quotation aligned with your exact potassium sulfate requirement—whether 50% K2O granular SOP for Pakistan’s potato belt or low-iron powder for precision glass—visit our potassium sulfate product page or request a quote today. Let chemistry work for your supply chain.
For procurement managers and chemical engineers, selecting the right potassium sulfate starts with a thorough understanding of the potassium and sulfate formula. K2SO4 – commonly referred to as sulfate of potash (SOP) – is far more than a simple fertilizer input. Its ionic composition, crystal structure, and purity profile directly influence performance in glass manufacturing, aluminum recycling, pharmaceutical production, and chlorine-free specialty agriculture. This guide dissects the chemical identity of K2SO4, translates technical specifications into procurement criteria, and shows how a reliable supply of premium potassium sulfate from Weifang Hailei Fine Chemical Co., Ltd. can optimize your industrial processes.
At its core, the potassium and sulfate formula is K2SO4. This inorganic salt consists of two potassium cations (K⁺) for every one sulfate anion (SO₄²⁻), forming a neutral potassium and sulfate ionic compound. The balanced charges explain the 2:1 stoichiometry: each potassium ion carries a +1 charge, while the sulfate ion carries a -2 charge, requiring two K⁺ to achieve electrical neutrality.
This ionic bond creates a crystalline lattice that is highly stable under standard conditions, with a melting point of 1,069°C and a density of 2.66 g/cm³. While K2SO4 is naturally occurring in minerals such as arcanite and aphthitalite, industrial-scale production typically involves the Mannheim process (reacting potassium chloride with sulfuric acid) or extraction from natural brines. For buyers, the synthetic route matters: Mannheim-process K2SO4 generally delivers higher consistency and lower chloride content—often below 0.5%—making it the preferred choice for chloride-sensitive applications.
From a procurement standpoint, recognizing the ionic nature of potassium sulfate is essential. It explains why the material dissolves endothermically in water (cooling the solution) and why particle size distribution can affect dissolution rates in fertigation or batch formulations. When evaluating technical data sheets, look for confirmation that the product meets the typical assay of ≥99% purity with a K2O content of no less than 50%.
Moving beyond the molecular formula, the potassium sulfate chemical structure in solid form is orthorhombic, belonging to the space group Pnma. In this arrangement, sulfate tetrahedra and potassium ions are organized in a regular, repeating pattern that imparts high thermal stability and predictable solubility behavior. Understanding this structure helps industrial users anticipate how K2SO4 will behave in melt applications like glass furnaces or as a flux in aluminum recycling.
The crystalline form directly influences bulk density, flowability, and resistance to caking. Premium SOP grades often undergo controlled crystallization to produce uniform, free-flowing granules or fine powders. For glass manufacturers, a fine particle size (typically <200 mesh) ensures rapid dissolution in the melt and minimizes seed formation. Aluminum recyclers, on the other hand, may prefer a granular product to control dusting while still providing a sufficient surface area for fluxing reactions.
Even minor structural impurities can disrupt performance. Excess chloride, for instance, can lead to corrosion in furnace equipment or cause phytotoxicity when used on chloride-sensitive crops. This is why the potassium and sulfate formula is only as good as the manufacturing process behind it—and why rigorous quality control at the production site is non-negotiable.
A complete potassium sulfate chemical profile goes far beyond K2O percentage. Sophisticated buyers evaluate a range of parameters that directly affect process efficiency, final product quality, and regulatory compliance. Based on international standards such as GB/T 20406-2017 (China) and EC fertilizer regulations, the following specifications form the backbone of any supplier qualification checklist:
An in-depth potassium sulfate chemical profile also includes trace nutrient data—iron, calcium, magnesium—which can be either beneficial (in specialty fertilizers) or detrimental (in optical glass manufacturing). Hailei Chemical provides full certificates of analysis (COA) with each shipment, enabling buyers to verify compliance before material enters their production line.
The unique combination of potassium and sulfur in one non-hygroscopic, non-flammable ionic compound makes K2SO4 indispensable across multiple sectors. While many guides focus on one application, here we summarize the performance attributes directly linked to the potassium and sulfate formula.
High-value crops such as tobacco, citrus, potatoes, and greenhouse vegetables demand potassium nutrition without the chloride stress associated with muriate of potash (KCl). Potassium sulfate delivers a K2O content of 50% along with 18% sulfur in sulfate form, a vital secondary nutrient for protein synthesis and enzyme activation. Because K2SO4 has a low salt index, it is ideal for fertigation and foliar sprays, reducing the risk of osmotic damage. The ionic dissociation of the potassium and sulfate ionic compound ensures both nutrients are immediately available to plants upon dissolution.
In the glass industry, potassium sulfate serves as a fining agent and flux. It lowers the melting temperature of silica, saving energy, and releases sulfur oxides that help refine the melt by removing bubbles. The absence of chloride prevents corrosion of furnace refractories and eliminates the risk of forming undesirable chloride fumes. A consistent potassium sulfate chemical structure and purity level are critical: any variation can alter the viscosity of the glass melt, affecting product uniformity. Hailei Chemical supplies glass-grade SOP with guaranteed chloride ≤0.1% and a fine powder specification to ensure rapid incorporation.
For aluminum recyclers, potassium sulfate is a component of salt fluxes used to protect the molten metal from oxidation and to strip impurities. The sulfate ion aids in the coalescence of aluminum droplets, improving yield. Here, the low melting point of a properly formulated K2SO4–NaCl–KCl flux is key, and the ionic character of the potassium and sulfate formula allows it to form eutectic mixtures with other salts. Industrial buyers in this sector prioritize a granular product with low dusting and consistent chemical profile to ensure safe, efficient flux injection.
Pharmaceutical manufacturers rely on high-purity potassium sulfate as an excipient and as a source of potassium and sulfate ions in the synthesis of active pharmaceutical ingredients. One notable area where the precision of the potassium and sulfate formula matters is in the production of nutraceutical compounds such as glucosamine sulfate potassium chloride. This double salt—often used in dietary supplements for joint health—stabilizes glucosamine sulfate with potassium chloride, ensuring the bioavailability of the sulfate moiety that is essential for proteoglycan synthesis in cartilage.
The uses of glucosamine sulfate potassium chloride range from osteoarthritis management to supporting connective tissue repair. In its manufacturing, raw potassium sulfate of pharmacopoeia grade is a critical starting material. Its ionic purity—especially undetectable levels of heavy metals and negligible chloride contamination—ensures that the final product meets USP/EP monographs. Hailei Chemical’s potassium sulfate, with its tightly controlled potassium sulfate chemical profile, can serve as a reliable input for companies producing pharmaceutical-grade potassium salts and nutraceutical complexes. By auditing the supplier’s full chemical specification, formulators can safeguard batch-to-batch consistency and regulatory compliance.
A buyer’s ability to deconstruct the potassium and sulfate formula into actionable specifications is the hallmark of a strategic sourcing professional. When comparing suppliers, move beyond price per metric ton and apply a technical audit framework:
Every industrial process that consumes K2SO4 is designed around a precise chemical expectation. A deviation in chloride content can shut down a glass furnace. A shift in particle size can disrupt metering systems in a fertilizer blending plant. A trace heavy metal above pharmacopoeia limits can cause an entire batch of nutraceutical product to be rejected. That is why understanding the potassium and sulfate formula—not just in theory but as a living specification—empowers buyers to build resilient, cost-effective supply chains.
At Weifang Hailei Fine Chemical Co., Ltd., we combine decades of fine chemical manufacturing expertise with a commitment to transparency. Our potassium sulfate product reliably exceeds 50% K2O, maintains chloride under 0.5% (and as low as 0.1% for specialty grades), and is available in custom particle sizes. Whether you are formulating a premium chlorine-free fertilizer, optimizing a glass batch, or synthesizing potassium-based nutraceuticals, our technical team can align the potassium and sulfate formula with your exact requirements.
Ready to secure a consistent, high-purity supply of K2SO4? Contact Hailei Chemical today for a detailed COA, sample, and competitive quotation tailored to your application.