When sourcing potassium sulfate for industrial or agricultural use, you’ll quickly encounter a variety of potassium sulfate other names that can cause confusion. Whether you call it sulfate of potash (SOP), K2SO4, arcanite, or 0-0-50 fertilizer, understanding the chemical’s identity is critical for precise specification matching and supplier evaluation. This guide clarifies every synonym, trade name, and grade designation so procurement professionals, chemical engineers, and industrial buyers can navigate the market with confidence.
Sulfate of potash is the most prevalent commercial name in agriculture. It emphasizes the product’s potassium content (potash) combined with sulfate ions. SOP is the standard term in fertilizer trading and is intrinsically linked to chlorine-free nutrient formulations for high-value crops such as tobacco, citrus, grapes, and potatoes.
In the geological and mining sector, potassium sulfate is often referred to as arcanite. This name appears in technical literature discussing natural deposits, mineral processing, and extraction methods. While industrial buyers rarely use ‘arcanite’ in purchase orders, recognising it helps when evaluating raw material sources or reviewing analytical reports from mined versus synthetic SOP.
The term 0-0-50 potassium sulfate refers specifically to the fertilizer grade with a guaranteed NPK rating of 0% nitrogen, 0% phosphorus pentoxide, and 50% water-soluble potassium oxide (K2O). This label strictly follows the standard fertilizer analysis convention in North America and parts of Asia. It does not represent a different chemical entity—it is the same K2SO4 with a minimum 50% K2O content. The 0-0-50 potassium sulfate page on our website details typical analytical results and compliance with international fertilizer standards.
In Commonwealth countries and many international contracts, the spelling ‘potassium sulphate‘ is used. Although chemically identical, this orthographic difference can cause indexing issues in databases. Procurement teams should ensure that both spellings are captured in ERP systems and RFP documents to avoid missing relevant supplier bids.
In laboratory specifications and technical datasheets, you will find the formula K2SO4 or the CAS number 7778-80-5. These are the most unambiguous potassium sulfate other names, immune to language or regional variations. Chemical engineers often use ‘dipotassium sulfate’ in inorganic chemistry contexts, though it is less common in trade.
Other less frequent potassium sulfate other names include ‘salt of Lemery’, ‘sal polychrestum’, and ‘tartar vitriolate’. While these are largely obsolete, they occasionally appear in legacy patents or specialized pharmaceutical reference texts. Understanding this nomenclature can prevent misidentification when evaluating older intellectual property or historical literature.
One of the most curious queries that surfaces is, ‘Is potassium sulfate a metal?’ The straightforward answer is no—potassium sulfate is not a metal; it is an inorganic salt. Yet this question often stems from a need to understand the material’s hazard classification, shipping requirements, or elemental composition. Let’s break down the chemistry to eliminate any ambiguity.
Potassium sulfate (K2SO4) comprises potassium cations (K+) and sulfate anions (SO42-). In its solid form, it is a white crystalline powder or granule with no metallic properties such as electrical conductivity or malleability. The potassium component itself is a metal in its elemental state, but when cationic in a salt, it behaves entirely differently. For transport and handling, potassium sulfate is not classified as a metal; it falls under general inorganic chemicals. It is not combustible, not a metal powder requiring special safety precautions, and it is not subject to regulations concerning water-reactive metals. However, some buyers may confuse potassium metal (UN 2257) with potassium sulfate—a critical distinction for safe logistics. Procurement specifications should always reference the correct CAS number and UN number (not regulated as dangerous goods) to prevent shipping delays.
This distinction is particularly relevant when importing into jurisdictions with strict metal-bearing substance legislation. Potassium sulfate is not a heavy metal compound, nor does it contain toxic metals; instead, it is an essential nutrient bearing potassium, calcium, magnesium, and sulfur benefits for agriculture. When you source from a reliable supplier, the detailed potassium sulfate product specifications will clarify its non-metallic nature and safe handling profile.
Beyond the different potassium sulfate other names, industrial procurement hinges on precise specifications. Here are the critical parameters you must verify when evaluating commercial offers, whether for fertilizer, glass manufacturing, or pharmaceutical applications.
The 0-0-50 designation directly ties to the potassium oxide (K2O) equivalent. Although potassium sulfate does not contain K2O per se, the fertilizer industry uses this convention to express potassium nutrient content. A 50% K2O minimum translates to approximately 41.5% actual potassium (K). Our premium SOP consistently achieves 51.5% K2O, a specification detail that ensures maximum nutrient density and reduced freight cost per unit of potassium shipped. When comparing suppliers, always ask for the guaranteed K2O percentage rather than relying solely on the ‘0-0-50’ label, as variations exist between 48% and 52% across global sources.
The molecular weight of potassium sulfate is 174.259 g/mol. This value is fundamental for industrial formulators and chemical engineers involved in precise blending, stoichiometric calculations, and quality control. For example, to supply 1 kilogram of pure potassium (K), you need 2.228 kg of K2SO4 (2 × 39.0983 / 174.259 = 0.4487, so inverse 2.228). In glass manufacturing, the molecular weight determines the amount of potassium sulfate required as a refining agent to achieve the desired melting behaviour and bubble removal. In pharmaceutical excipient applications, the exact molar mass is essential for master formula records and regulatory submissions. Reputable suppliers will state the molecular weight clearly in their certificate of analysis, often alongside moisture content (max 0.5%), chloride (max 0.1–0.5%), and pH (7–9). These data points together validate the product’s purity and suitability.
| Parameter | Specification |
|---|---|
| Appearance | White powder / granular |
| K2O content | 50.0% min (typical 51.5%) |
| Chloride (Cl) | ≤0.5% |
| Moisture | ≤0.5% |
| Water solubility (20°C) | 120 g/L |
| Bulk density | 1.2–1.3 g/cm³ (granular) |
| pH (1% solution) | 7.0–9.0 |
| Molecular weight | 174.259 g/mol |
| CAS number | 7778-80-5 |
| Sulfur (S) content | 18% min |
This typical specification sheet represents a chlorine-free potassium sulfate grade suitable for both fertigation and industrial processes. Buyers should request samples and full analysis alongside the commercial offer to confirm batch-to-batch consistency.
In international trade, inconsistent nomenclature can lead to serious quality disputes. When drafting or responding to a request for quotation, align all potassium sulfate other names with an unambiguous reference—preferably the CAS number and the chemical formula K2SO4. Here are practical steps to eliminate ambiguity:
Procurement managers are encouraged to use a dedicated line in the contract: “K2SO4 (Sulfate of Potash, SOP, Potassium Sulfate), 0-0-50 fertilizer grade, CAS 7778-80-5, minimum 50% K2O, chlorine-free, granular.” This single sentence captures all relevant potassium sulfate other names while setting clear technical boundaries.
The ambiguity surrounding potassium sulfate other names has real economic consequences in agriculture. Many specialty crop programs demand chlorine-free potassium sources to avoid toxicity in chloride-sensitive plants. Mistaking SOP for MOP (muriate of potash, potassium chloride) due to sloppy naming can result in severe crop damage and financial loss. The 0-0-50 potassium sulfate designation is particularly important in fertigation schedules because it quantifies the nutrient input precisely: applying 100 kg of 0-0-50 delivers 50 kg of K2O—far different from a 0-0-52 SOP that would alter the nutrient formula. Growers and fertilizer importers must demand that every shipment is accompanied by a label clearly stating “Sulfate of Potash (Potassium Sulfate) 0-0-50” and not generic ‘potash’, which could be mistaken for potassium chloride.
Furthermore, organic certification bodies such as OMRI and ECOCERT have strict rules about the origin and processing of potassium sulfate. They recognize the product only when referred to as sulfate of potash derived from natural langbeinite ores, for example. Using incorrect potassium sulfate other names on organic input documentation can lead to decertification of entire crop lots. Thus, precise language is a regulatory compliance issue as much as a commercial one.
Different industries have developed their own preferred potassium sulfate other names, reflecting the product’s role in their processes:
Glassmakers typically order ‘potassium sulfate’ or ‘K2SO4’ as a refining agent and flux. They focus on purity, iron content below 200 ppm, and particle size uniformity to ensure homogeneous melt behaviour. In this sector, you will almost never see the term 0-0-50; instead, technical grade potassium sulfate or pure K2SO4 appears on bills of lading.
In aluminum dross processing and scrap remelting, potassium sulfate is introduced as a salt flux to protect the melt from oxidation and improve metal recovery. Here, it is commonly called ‘fluxing grade potassium sulfate’ or simply ‘K2SO4 flux’. The sulfate ion plays a different role than in fertilizer, so the name often drops any agricultural connotation entirely.
Pharmacopoeia monographs list the substance as ‘Potassium Sulfate’ (USP) or ‘Potassium Sulphate’ (Ph. Eur.). For regulated industries, the only acceptable potassium sulfate other names are the official compendial titles. Brokers should not substitute terms like SOP when dealing with pharmaceutical purchasing departments, as this could trigger audit non-conformities. The premium sulfate of potash from Hailei Chemical can be supplied with necessary pharmacopoeia compliance documents on request.
Wallboard manufacturers use potassium sulfate as an accelerator or additive to control setting time. Again, the material is simply called potassium sulfate or K2SO4, often with a specific particle size and purity that differs from agricultural grades. The 0-0-50 label is irrelevant here, but the same chemical entity is being consumed.
This industry-by-industry mapping underscores why buyers must communicate clearly using the name that matches the intended use and required certification, while always linking back to the same chemical identity.
With all the potassium sulfate other names clarified, the final challenge is supplier selection. A trustworthy partner like Hailei Chemical offers:
Whether you import potassium sulfate under the name SOP, arcanite, or 0-0-50 fertilizer, the supplier’s ability to align the delivered product with your exact specifications matters most. Request samples, evaluate the molecular weight and purity data, and verify that all potassium sulfate other names used in your contracts point definitively to K2SO4 CAS 7778-80-5.
Ready to source high-quality potassium sulfate? Request a quote today and let our experts help you match the right grade to your exact application requirements.
When sourcing chemical raw materials, clarity in nomenclature is essential to avoid costly mistakes. Potassium sulfate other names such as sulfate of potash (SOP), arcanite, and K2SO4 can cause confusion among procurement professionals who must verify exactly what they are purchasing. Whether you are an importer of specialty fertilizers, a glass manufacturer, or a pharmaceutical producer, understanding the full range of synonyms and the corresponding quality specifications is the first step toward a reliable supply chain. This buyer-focused guide decodes the multiple identities of potassium sulfate, clarifies its chemical nature, examines industry-standard specifications, and provides actionable criteria for selecting a trusted supplier.
Because potassium sulfate serves both agricultural and industrial sectors, it appears under various chemical, commercial, and historical names. Awareness of potassium sulfate other names helps buyers cross-reference technical data sheets, customs documentation, and supplier certificates without ambiguity. The following table lists the most widely recognized synonyms, along with the context in which each is used.
| Synonym | Typical Usage Context |
|---|---|
| Sulfate of potash (SOP) | Agricultural fertilizer trade, especially chlorine-free formulations |
| Potassium sulphate | British English spelling, common in EU and Commonwealth markets |
| K2SO4 | Chemical formula, used on safety data sheets and lab documentation |
| Arcanite | Mineralogical name; occasionally seen in niche industrial references |
| Salt of Lemery | Historical pharmaceutical name, rarely used today |
| Tartarus vitriolatus | Archaic alchemical term; may appear in legacy pharmacopoeias |
| Sulfuric acid dipotassium salt | Systematic IUPAC name; prevalent in chemical registries and patents |
In international trade, sulfate of potash (SOP) dominates the fertilizer sector, while K2SO4 and potassium sulfate are standard across technical documentation. Buyers encountering potassium sulfate other names on a supplier’s certificate of analysis should always verify that the CAS number 7778-80-5 matches, as this unique identifier eliminates any doubt about the material identity.
A fundamental question often arises among newcomers to chemical procurement: “Is potassium sulfate a metal?” The short answer is no. Potassium sulfate is an inorganic salt composed of potassium cations (K+) and sulfate anions (SO42−). It is a white crystalline solid at room temperature and is highly soluble in water. Its metallic constituent, potassium, is an alkali metal, but the compound itself is not a metal; it does not conduct electricity in solid form, nor does it exhibit metallic luster or malleability. This distinction is critical for logistics teams that must classify materials for safe transportation and storage.
From a quality control standpoint, one of the most important physical constants is the molecular weight of potassium sulfate. The molecular weight (or more precisely, the formula mass) of K2SO4 is 174.259 g/mol. This value is indispensable when preparing gravimetric standards, calculating molar concentrations for pharmaceutical buffer systems, or verifying batch consistency through stoichiometric analysis. A reputable supplier will list the molecular weight on the certificate of analysis alongside other physicochemical data such as melting point (1,069°C) and relative density (2.66 g/cm³).
When evaluating a commercial sample, the molecular weight itself does not change, but impurities may alter the apparent molar mass in titration methods. Buyers should always request a full potassium sulfate product specification that includes purity percentage, as this directly impacts the utility of the molecular weight in industrial formulations.
Procurement teams rely on precise potassium sulphate specification sheets to ensure that the delivered material meets end-use requirements. Although the chemical formula remains constant, the permissible levels of impurities, particle size distribution, and packaging vary significantly depending on the application. The table below outlines typical specifications for premium-grade potassium sulfate.
| Parameter | Typical Value / Range | Relevance |
|---|---|---|
| K2O content (water-soluble) | 50.0% minimum | Defines fertilizer grade; often labeled 0-0-50 potassium sulfate |
| Chloride (Cl) | ≤ 0.5% | Critical for chlorine-sensitive crops and pharmaceutical use |
| Moisture | ≤ 0.5% | Prevents caking during storage and improves flowability |
| Water-insoluble matter | ≤ 0.05% | Ensures clarity in glass melts and pharmaceutical solutions |
| pH (5% solution) | 2.5–4.0 | Acidic nature due to slight hydrolysis; buffering considerations |
| Heavy metals (as Pb) | ≤ 5 ppm | Pharmaceutical and food-grade compliance |
| Particle size (mesh) | Customizable: fine powder (200 mesh) to crystalline granules | Adjusts dissolution rate and blending homogeneity |
The fertilizer grade 0-0-50 potassium sulfate is a standard designation in North America, indicating zero nitrogen, zero phosphorus, and 50% soluble potash (K2O). This high-concentration, chloride-free formulation makes SOP the preferred choice for tobacco, citrus, grapes, potatoes, and other high-value crops that are sensitive to chloride toxicity. When reviewing a potassium sulphate specification, agricultural importers must confirm that the K2O content is expressed on a water-soluble basis, as this directly influences nutrient availability.
For industrial users such as glass manufacturers, the particle size and purity levels dictate the melting behavior and the optical quality of the final product. Hailei Chemical’s potassium sulfate is produced to meet both standard and customized specifications, with uniform granularity that ensures consistent furnace feed.
While we’ve established that potassium sulfate itself is not a metal, the persistent question “is potassium sulfate a metal” arises because it contains the element potassium, which is an alkali metal. In its pure elemental state, potassium is a soft, silvery-white metal that reacts violently with water. However, in potassium sulfate, potassium exists as a cation (K+), completely stripped of its metallic properties. The compound is an ionic salt, not a metal, and it dissolves in water without producing free electrons. This distinction matters for handling, transport classification, and material compatibility: potassium sulfate does not require the same precautions as metallic potassium, which must be stored under oil to prevent oxidation.
Another related misconception involves the term “potash.” Potash broadly refers to potassium compounds, often carbonates or chlorides, but in commercial fertilizers “potash” is measured as K2O equivalent. Thus, 0-0-50 potassium sulfate contains 50% K2O by weight, even though the compound itself is K2SO4, not the oxide. Understanding that the K2O percentage is a conventional expression of potassium content helps avoid confusion when comparing different potassium sources such as MOP (muriate of potash, KCl) and SOP.
For specialty fertilizer importers, the designation 0-0-50 potassium sulfate is more than a label; it’s a promise of chloride-free potassium nutrition. Many high-value crops exhibit leaf burn, reduced yield, or poor fruit quality when exposed to chloride ions. SOP delivers potassium and sulfur—both essential macronutrients—without the chloride stress associated with muriate of potash.
Global demand for SOP continues to rise as farmers shift toward chloride-free programs to meet export quality standards for fruits and vegetables. This trend makes premium potassium sulfate a strategic procurement item for distributors serving protected horticulture and organic farming markets (where allowed by local regulations).
While agriculture consumes the largest volume of potassium sulfate, industrial applications demand high purity and consistent physical properties. Glass manufacturers use potassium sulfate as a refining agent and flux. It lowers the melting temperature of silica, improves the workability of the glass melt, and enhances brilliance. In aluminum recycling, potassium sulfate serves as a flux to protect the molten metal from oxidation and to remove impurities, increasing metal recovery rates.
The pharmaceutical industry utilizes potassium sulfate as an excipient in tablet formulations and as an electrolyte replenisher in certain preparations. The strict requirements of pharmacopoeia monographs (e.g., USP, EP) call for exceptionally low heavy metals and a defined molecular weight. Here, the molecular weight of potassium sulfate (174.26 g/mol) is critical for accurate dosing and analytical standardization.
An emerging application is the use of high-purity potassium sulfate as an additive in gypsum board production. The potassium sulfate acts as an accelerator, reducing the setting time of gypsum plaster without compromising the final board strength. This application requires a fine, free-flowing powder that disperses evenly, a specification that Hailei Chemical can meet with micronized grades.
Selecting a potassium sulfate supplier goes beyond comparing unit prices. B2B buyers must evaluate the entire value proposition, from technical capability to logistics reliability. The following checklist can serve as a framework for due diligence:
At Hailei Chemical, we understand that every shipment of potassium sulfate must arrive on time and on spec. With a dedicated export team and in-house quality control laboratory, we provide full traceability from raw material intake to container loading. Our potassium sulphate specification documents are shared proactively during the negotiation stage, empowering buyers to make informed decisions without ambiguity. Additionally, our technical staff can assist in translating between the potassium sulfate other names found in different national standards, ensuring that you order exactly the grade you need.
Mastering the vocabulary of potassium sulfate—from its common synonyms to its precise specification parameters—enables B2B buyers to communicate effectively with suppliers and avoid discrepancies that lead to shipment rejections or formulation failures. Whether you know it as sulfate of potash, arcanite, or simply SOP, the same molecular weight and quality benchmarks apply. By focusing on critical data such as the 50% K2O guarantee, chloride content, and particle size, procurement professionals can secure a consistent supply that meets the demands of fertilizer blenders, glass furnaces, aluminum recyclers, and pharmaceutical formulators alike.
Ready to source high-purity potassium sulfate with complete documentation and reliable logistics? Request a quote or explore the technical details of our potassium sulfate product page to find the grade that fits your industrial or agricultural requirements. Hailei Chemical’s experts are available to discuss your specifications, packaging preferences, and delivery schedules.
When sourcing chemical raw materials, clarity in nomenclature is essential to avoid costly mistakes. Potassium sulfate other names such as sulfate of potash (SOP), arcanite, and K2SO4 can cause confusion among procurement professionals who must verify exactly what they are purchasing. Whether you are an importer of specialty fertilizers, a glass manufacturer, or a pharmaceutical producer, understanding the full range of synonyms and the corresponding quality specifications is the first step toward a reliable supply chain. This buyer-focused guide decodes the multiple identities of potassium sulfate, clarifies its chemical nature, examines industry-standard specifications, and provides actionable criteria for selecting a trusted supplier.
Because potassium sulfate serves both agricultural and industrial sectors, it appears under various chemical, commercial, and historical names. Awareness of potassium sulfate other names helps buyers cross-reference technical data sheets, customs documentation, and supplier certificates without ambiguity. The following table lists the most widely recognized synonyms, along with the context in which each is used.
| Synonym | Typical Usage Context |
|---|---|
| Sulfate of potash (SOP) | Agricultural fertilizer trade, especially chlorine-free formulations |
| Potassium sulphate | British English spelling, common in EU and Commonwealth markets |
| K2SO4 | Chemical formula, used on safety data sheets and lab documentation |
| Arcanite | Mineralogical name; occasionally seen in niche industrial references |
| Salt of Lemery | Historical pharmaceutical name, rarely used today |
| Tartarus vitriolatus | Archaic alchemical term; may appear in legacy pharmacopoeias |
| Sulfuric acid dipotassium salt | Systematic IUPAC name; prevalent in chemical registries and patents |
In international trade, sulfate of potash (SOP) dominates the fertilizer sector, while K2SO4 and potassium sulfate are standard across technical documentation. Buyers encountering potassium sulfate other names on a supplier’s certificate of analysis should always verify that the CAS number 7778-80-5 matches, as this unique identifier eliminates any doubt about the material identity.
A fundamental question often arises among newcomers to chemical procurement: “Is potassium sulfate a metal?” The short answer is no. Potassium sulfate is an inorganic salt composed of potassium cations (K+) and sulfate anions (SO42−). It is a white crystalline solid at room temperature and is highly soluble in water. Its metallic constituent, potassium, is an alkali metal, but the compound itself is not a metal; it does not conduct electricity in solid form, nor does it exhibit metallic luster or malleability. This distinction is critical for logistics teams that must classify materials for safe transportation and storage.
From a quality control standpoint, one of the most important physical constants is the molecular weight of potassium sulfate. The molecular weight (or more precisely, the formula mass) of K2SO4 is 174.259 g/mol. This value is indispensable when preparing gravimetric standards, calculating molar concentrations for pharmaceutical buffer systems, or verifying batch consistency through stoichiometric analysis. A reputable supplier will list the molecular weight on the certificate of analysis alongside other physicochemical data such as melting point (1,069°C) and relative density (2.66 g/cm³).
When evaluating a commercial sample, the molecular weight itself does not change, but impurities may alter the apparent molar mass in titration methods. Buyers should always request a full potassium sulfate product specification that includes purity percentage, as this directly impacts the utility of the molecular weight in industrial formulations.
Procurement teams rely on precise potassium sulphate specification sheets to ensure that the delivered material meets end-use requirements. Although the chemical formula remains constant, the permissible levels of impurities, particle size distribution, and packaging vary significantly depending on the application. The table below outlines typical specifications for premium-grade potassium sulfate.
| Parameter | Typical Value / Range | Relevance |
|---|---|---|
| K2O content (water-soluble) | 50.0% minimum | Defines fertilizer grade; often labeled 0-0-50 potassium sulfate |
| Chloride (Cl) | ≤ 0.5% | Critical for chlorine-sensitive crops and pharmaceutical use |
| Moisture | ≤ 0.5% | Prevents caking during storage and improves flowability |
| Water-insoluble matter | ≤ 0.05% | Ensures clarity in glass melts and pharmaceutical solutions |
| pH (5% solution) | 2.5–4.0 | Acidic nature due to slight hydrolysis; buffering considerations |
| Heavy metals (as Pb) | ≤ 5 ppm | Pharmaceutical and food-grade compliance |
| Particle size (mesh) | Customizable: fine powder (200 mesh) to crystalline granules | Adjusts dissolution rate and blending homogeneity |
The fertilizer grade 0-0-50 potassium sulfate is a standard designation in North America, indicating zero nitrogen, zero phosphorus, and 50% soluble potash (K2O). This high-concentration, chloride-free formulation makes SOP the preferred choice for tobacco, citrus, grapes, potatoes, and other high-value crops that are sensitive to chloride toxicity. When reviewing a potassium sulphate specification, agricultural importers must confirm that the K2O content is expressed on a water-soluble basis, as this directly influences nutrient availability.
For industrial users such as glass manufacturers, the particle size and purity levels dictate the melting behavior and the optical quality of the final product. Hailei Chemical’s potassium sulfate is produced to meet both standard and customized specifications, with uniform granularity that ensures consistent furnace feed.
While we’ve established that potassium sulfate itself is not a metal, the persistent question “is potassium sulfate a metal” arises because it contains the element potassium, which is an alkali metal. In its pure elemental state, potassium is a soft, silvery-white metal that reacts violently with water. However, in potassium sulfate, potassium exists as a cation (K+), completely stripped of its metallic properties. The compound is an ionic salt, not a metal, and it dissolves in water without producing free electrons. This distinction matters for handling, transport classification, and material compatibility: potassium sulfate does not require the same precautions as metallic potassium, which must be stored under oil to prevent oxidation.
Another related misconception involves the term “potash.” Potash broadly refers to potassium compounds, often carbonates or chlorides, but in commercial fertilizers “potash” is measured as K2O equivalent. Thus, 0-0-50 potassium sulfate contains 50% K2O by weight, even though the compound itself is K2SO4, not the oxide. Understanding that the K2O percentage is a conventional expression of potassium content helps avoid confusion when comparing different potassium sources such as MOP (muriate of potash, KCl) and SOP.
For specialty fertilizer importers, the designation 0-0-50 potassium sulfate is more than a label; it’s a promise of chloride-free potassium nutrition. Many high-value crops exhibit leaf burn, reduced yield, or poor fruit quality when exposed to chloride ions. SOP delivers potassium and sulfur—both essential macronutrients—without the chloride stress associated with muriate of potash.
Global demand for SOP continues to rise as farmers shift toward chloride-free programs to meet export quality standards for fruits and vegetables. This trend makes premium potassium sulfate a strategic procurement item for distributors serving protected horticulture and organic farming markets (where allowed by local regulations).
While agriculture consumes the largest volume of potassium sulfate, industrial applications demand high purity and consistent physical properties. Glass manufacturers use potassium sulfate as a refining agent and flux. It lowers the melting temperature of silica, improves the workability of the glass melt, and enhances brilliance. In aluminum recycling, potassium sulfate serves as a flux to protect the molten metal from oxidation and to remove impurities, increasing metal recovery rates.
The pharmaceutical industry utilizes potassium sulfate as an excipient in tablet formulations and as an electrolyte replenisher in certain preparations. The strict requirements of pharmacopoeia monographs (e.g., USP, EP) call for exceptionally low heavy metals and a defined molecular weight. Here, the molecular weight of potassium sulfate (174.26 g/mol) is critical for accurate dosing and analytical standardization.
An emerging application is the use of high-purity potassium sulfate as an additive in gypsum board production. The potassium sulfate acts as an accelerator, reducing the setting time of gypsum plaster without compromising the final board strength. This application requires a fine, free-flowing powder that disperses evenly, a specification that Hailei Chemical can meet with micronized grades.
Selecting a potassium sulfate supplier goes beyond comparing unit prices. B2B buyers must evaluate the entire value proposition, from technical capability to logistics reliability. The following checklist can serve as a framework for due diligence:
At Hailei Chemical, we understand that every shipment of potassium sulfate must arrive on time and on spec. With a dedicated export team and in-house quality control laboratory, we provide full traceability from raw material intake to container loading. Our potassium sulphate specification documents are shared proactively during the negotiation stage, empowering buyers to make informed decisions without ambiguity. Additionally, our technical staff can assist in translating between the potassium sulfate other names found in different national standards, ensuring that you order exactly the grade you need.
Mastering the vocabulary of potassium sulfate—from its common synonyms to its precise specification parameters—enables B2B buyers to communicate effectively with suppliers and avoid discrepancies that lead to shipment rejections or formulation failures. Whether you know it as sulfate of potash, arcanite, or simply SOP, the same molecular weight and quality benchmarks apply. By focusing on critical data such as the 50% K2O guarantee, chloride content, and particle size, procurement professionals can secure a consistent supply that meets the demands of fertilizer blenders, glass furnaces, aluminum recyclers, and pharmaceutical formulators alike.
Ready to source high-purity potassium sulfate with complete documentation and reliable logistics? Request a quote or explore the technical details of our potassium sulfate product page to find the grade that fits your industrial or agricultural requirements. Hailei Chemical’s experts are available to discuss your specifications, packaging preferences, and delivery schedules.
When sourcing chemical raw materials, clarity in nomenclature is essential to avoid costly mistakes. Potassium sulfate other names such as sulfate of potash (SOP), arcanite, and K2SO4 can cause confusion among procurement professionals who must verify exactly what they are purchasing. Whether you are an importer of specialty fertilizers, a glass manufacturer, or a pharmaceutical producer, understanding the full range of synonyms and the corresponding quality specifications is the first step toward a reliable supply chain. This buyer-focused guide decodes the multiple identities of potassium sulfate, clarifies its chemical nature, examines industry-standard specifications, and provides actionable criteria for selecting a trusted supplier.
Because potassium sulfate serves both agricultural and industrial sectors, it appears under various chemical, commercial, and historical names. Awareness of potassium sulfate other names helps buyers cross-reference technical data sheets, customs documentation, and supplier certificates without ambiguity. The following table lists the most widely recognized synonyms, along with the context in which each is used.
| Synonym | Typical Usage Context |
|---|---|
| Sulfate of potash (SOP) | Agricultural fertilizer trade, especially chlorine-free formulations |
| Potassium sulphate | British English spelling, common in EU and Commonwealth markets |
| K2SO4 | Chemical formula, used on safety data sheets and lab documentation |
| Arcanite | Mineralogical name; occasionally seen in niche industrial references |
| Salt of Lemery | Historical pharmaceutical name, rarely used today |
| Tartarus vitriolatus | Archaic alchemical term; may appear in legacy pharmacopoeias |
| Sulfuric acid dipotassium salt | Systematic IUPAC name; prevalent in chemical registries and patents |
In international trade, sulfate of potash (SOP) dominates the fertilizer sector, while K2SO4 and potassium sulfate are standard across technical documentation. Buyers encountering potassium sulfate other names on a supplier’s certificate of analysis should always verify that the CAS number 7778-80-5 matches, as this unique identifier eliminates any doubt about the material identity.
A fundamental question often arises among newcomers to chemical procurement: “Is potassium sulfate a metal?” The short answer is no. Potassium sulfate is an inorganic salt composed of potassium cations (K+) and sulfate anions (SO42−). It is a white crystalline solid at room temperature and is highly soluble in water. Its metallic constituent, potassium, is an alkali metal, but the compound itself is not a metal; it does not conduct electricity in solid form, nor does it exhibit metallic luster or malleability. This distinction is critical for logistics teams that must classify materials for safe transportation and storage.
From a quality control standpoint, one of the most important physical constants is the molecular weight of potassium sulfate. The molecular weight (or more precisely, the formula mass) of K2SO4 is 174.259 g/mol. This value is indispensable when preparing gravimetric standards, calculating molar concentrations for pharmaceutical buffer systems, or verifying batch consistency through stoichiometric analysis. A reputable supplier will list the molecular weight on the certificate of analysis alongside other physicochemical data such as melting point (1,069°C) and relative density (2.66 g/cm³).
When evaluating a commercial sample, the molecular weight itself does not change, but impurities may alter the apparent molar mass in titration methods. Buyers should always request a full potassium sulfate product specification that includes purity percentage, as this directly impacts the utility of the molecular weight in industrial formulations.
Procurement teams rely on precise potassium sulphate specification sheets to ensure that the delivered material meets end-use requirements. Although the chemical formula remains constant, the permissible levels of impurities, particle size distribution, and packaging vary significantly depending on the application. The table below outlines typical specifications for premium-grade potassium sulfate.
| Parameter | Typical Value / Range | Relevance |
|---|---|---|
| K2O content (water-soluble) | 50.0% minimum | Defines fertilizer grade; often labeled 0-0-50 potassium sulfate |
| Chloride (Cl) | ≤ 0.5% | Critical for chlorine-sensitive crops and pharmaceutical use |
| Moisture | ≤ 0.5% | Prevents caking during storage and improves flowability |
| Water-insoluble matter | ≤ 0.05% | Ensures clarity in glass melts and pharmaceutical solutions |
| pH (5% solution) | 2.5–4.0 | Acidic nature due to slight hydrolysis; buffering considerations |
| Heavy metals (as Pb) | ≤ 5 ppm | Pharmaceutical and food-grade compliance |
| Particle size (mesh) | Customizable: fine powder (200 mesh) to crystalline granules | Adjusts dissolution rate and blending homogeneity |
The fertilizer grade 0-0-50 potassium sulfate is a standard designation in North America, indicating zero nitrogen, zero phosphorus, and 50% soluble potash (K2O). This high-concentration, chloride-free formulation makes SOP the preferred choice for tobacco, citrus, grapes, potatoes, and other high-value crops that are sensitive to chloride toxicity. When reviewing a potassium sulphate specification, agricultural importers must confirm that the K2O content is expressed on a water-soluble basis, as this directly influences nutrient availability.
For industrial users such as glass manufacturers, the particle size and purity levels dictate the melting behavior and the optical quality of the final product. Hailei Chemical’s potassium sulfate is produced to meet both standard and customized specifications, with uniform granularity that ensures consistent furnace feed.
While we’ve established that potassium sulfate itself is not a metal, the persistent question “is potassium sulfate a metal” arises because it contains the element potassium, which is an alkali metal. In its pure elemental state, potassium is a soft, silvery-white metal that reacts violently with water. However, in potassium sulfate, potassium exists as a cation (K+), completely stripped of its metallic properties. The compound is an ionic salt, not a metal, and it dissolves in water without producing free electrons. This distinction matters for handling, transport classification, and material compatibility: potassium sulfate does not require the same precautions as metallic potassium, which must be stored under oil to prevent oxidation.
Another related misconception involves the term “potash.” Potash broadly refers to potassium compounds, often carbonates or chlorides, but in commercial fertilizers “potash” is measured as K2O equivalent. Thus, 0-0-50 potassium sulfate contains 50% K2O by weight, even though the compound itself is K2SO4, not the oxide. Understanding that the K2O percentage is a conventional expression of potassium content helps avoid confusion when comparing different potassium sources such as MOP (muriate of potash, KCl) and SOP.
For specialty fertilizer importers, the designation 0-0-50 potassium sulfate is more than a label; it’s a promise of chloride-free potassium nutrition. Many high-value crops exhibit leaf burn, reduced yield, or poor fruit quality when exposed to chloride ions. SOP delivers potassium and sulfur—both essential macronutrients—without the chloride stress associated with muriate of potash.
Global demand for SOP continues to rise as farmers shift toward chloride-free programs to meet export quality standards for fruits and vegetables. This trend makes premium potassium sulfate a strategic procurement item for distributors serving protected horticulture and organic farming markets (where allowed by local regulations).
While agriculture consumes the largest volume of potassium sulfate, industrial applications demand high purity and consistent physical properties. Glass manufacturers use potassium sulfate as a refining agent and flux. It lowers the melting temperature of silica, improves the workability of the glass melt, and enhances brilliance. In aluminum recycling, potassium sulfate serves as a flux to protect the molten metal from oxidation and to remove impurities, increasing metal recovery rates.
The pharmaceutical industry utilizes potassium sulfate as an excipient in tablet formulations and as an electrolyte replenisher in certain preparations. The strict requirements of pharmacopoeia monographs (e.g., USP, EP) call for exceptionally low heavy metals and a defined molecular weight. Here, the molecular weight of potassium sulfate (174.26 g/mol) is critical for accurate dosing and analytical standardization.
An emerging application is the use of high-purity potassium sulfate as an additive in gypsum board production. The potassium sulfate acts as an accelerator, reducing the setting time of gypsum plaster without compromising the final board strength. This application requires a fine, free-flowing powder that disperses evenly, a specification that Hailei Chemical can meet with micronized grades.
Selecting a potassium sulfate supplier goes beyond comparing unit prices. B2B buyers must evaluate the entire value proposition, from technical capability to logistics reliability. The following checklist can serve as a framework for due diligence:
At Hailei Chemical, we understand that every shipment of potassium sulfate must arrive on time and on spec. With a dedicated export team and in-house quality control laboratory, we provide full traceability from raw material intake to container loading. Our potassium sulphate specification documents are shared proactively during the negotiation stage, empowering buyers to make informed decisions without ambiguity. Additionally, our technical staff can assist in translating between the potassium sulfate other names found in different national standards, ensuring that you order exactly the grade you need.
Mastering the vocabulary of potassium sulfate—from its common synonyms to its precise specification parameters—enables B2B buyers to communicate effectively with suppliers and avoid discrepancies that lead to shipment rejections or formulation failures. Whether you know it as sulfate of potash, arcanite, or simply SOP, the same molecular weight and quality benchmarks apply. By focusing on critical data such as the 50% K2O guarantee, chloride content, and particle size, procurement professionals can secure a consistent supply that meets the demands of fertilizer blenders, glass furnaces, aluminum recyclers, and pharmaceutical formulators alike.
Ready to source high-purity potassium sulfate with complete documentation and reliable logistics? Request a quote or explore the technical details of our potassium sulfate product page to find the grade that fits your industrial or agricultural requirements. Hailei Chemical’s experts are available to discuss your specifications, packaging preferences, and delivery schedules.