TCS Industries Limited (China-sourced API supplier) supplies Potassium Sulfate -– Chloride-Free Potassium & Sulfur Source CAS 7778-80-5 for pharmaceutical B2B procurement — COA, MSDS, and technical documentation available on request.
> Overview
| Product Name | Potassium Sulfate -– Chloride-Free Potassium & Sulfur Source |
|---|---|
| Structural Formula |  |
| CAS Number | 7778-80-5 |
| Molecular Formula | K2O4S |
| Molecular Weight | 174.26 g/mol |
| InChIKey | OTYBMLCTZGSZBG-UHFFFAOYSA-L |
| SMILES | Available on request where applicable |
| Appearance | White crystalline powder or granules |
| Purity / Grade | By agreed specification and batch COA |
| Storage | Keep tightly closed in a cool, dry, well-ventilated place |
Potassium Sulfate (CAS 7778-80-5) is an inorganic salt with the formula K₂SO₄, containing 44.9% K₂O and 18.4% S. It is valued as a chloride-free potassium source for chloride-sensitive crops (tobacco, fruit trees, potatoes, grapes) where potassium chloride (muriate of potash) would cause leaf burn or quality reduction. Potassium sulfate is also used as a pharmaceutical excipient and reagent.
TCS Industries Limited, a Hong Kong-based trading and sourcing company, supplies Potassium Sulfate in fertilizer, food and pharmaceutical grades for global procurement programs.
> Applications
Chloride-free potassium fertilizer
Potassium sulfate (SOP, sulfate of potash) is the preferred potassium source for crops sensitive to chloride toxicity. Tobacco, citrus, grapes, stone fruits, berries and potatoes benefit from SOP application over MOP (muriate of potash / KCl). Application rates depend on soil K status and crop demand, typically 100–300 kg/ha. SOP is produced from natural brines (Great Salt Lake), Mannheim process (KCl + H₂SO₄), or langbeinite processing.
Food and pharmaceutical applications
Potassium sulfate is used as a food-grade mineral source and processing aid. In pharmaceutical formulations, it serves as a potassium source and tonicity adjuster. The pharmaceutical grade must meet USP-NF or Ph.Eur. monograph specifications. Zörb et al. (J Plant Nutr Soil Sci, 2014, 177:649–667) reviewed potassium nutrition effects on crop quality, directly relevant to sourcing grade selection.
> Sourcing & Supply
TCS Industries Limited supports development, qualification and commercial purchasing discussions for Potassium Sulfate -– Chloride-Free Potassium & Sulfur Source with buyers in South America, Europe, the United Kingdom, Australia, New Zealand, Mexico and Canada.
- Evaluation and commercial quantities: 25 kg bags for qualification; pallet and bulk (FIBC) for production. Granular and powder forms, fertilizer/food/pharma grades available.
- Pallet quantities and production campaigns: repeat supply is coordinated against packaging, lead time, annual demand and destination-market import requirements.
> Quality & Documentation
Key specification parameters include K₂O content (≥50% for standard SOP, ≥52% for premium grade), chloride (≤1.0% for standard SOP, ≤0.5% for low-Cl grade), sulfate, moisture, water-insoluble matter, and heavy metals. Pharmaceutical grade: assay (≥99.0% K₂SO₄ on dried basis), heavy metals (Pb ≤10 ppm), arsenic, chloride, iron per USP-NF. Food grade: per FCC or relevant national standard. COA and MSDS are standard.
> Packaging
Potassium Sulfate is non-hygroscopic under normal storage conditions. Standard packaging includes 25 kg or 50 kg woven PP bags with PE liner (fertilizer grade), 25 kg paper bags (food/pharma grade), and palletized shrink-wrapped units. 1000 kg FIBC available for bulk orders. Store in dry conditions. Labels and documents are checked before dispatch.
> Pricing & MOQ
Pricing is quoted by specification, packaging and destination. Common commercial discussions use 25 kg bag/drum formats, pallet quantities and production-campaign planning; smaller samples may be reviewed for qualified formulation teams.
> Regulatory & Compounding Context
Potassium Sulfate is listed in USP-NF and Ph.Eur. (Kalii sulfas). FDA IID-listed. Food-grade K₂SO₄ is GRAS in the US (21 CFR 182.6985). Registered as a fertilizer under EU FPR and national regulations. Approved for organic farming (EU and USDA NOP) when derived from natural mineral sources. No special import permits for standard grades.
> Alias Index
- IUPAC: Dipotassium sulfate
- CAS Number: 7778-80-5
- Formula: K₂SO₄ (MW 174.26 g/mol)
- Common names: Sulfate of potash (SOP), Potassium sulphate, Arcanite (mineral), Sal polychrestum
- Nutrient content: 44.9% K₂O, 18.4% S
- Pharmacopoeial name: Kalii sulfas (Ph.Eur.)
- InChIKey: OTYBMLCTZGSZBG-UHFFFAOYSA-L
- Commercial request terms: SOP supplier, sulfate of potash, K2SO4 pharma grade, chloride-free potassium fertilizer, TCS Industries Limited
> FAQ
Why use Potassium Sulfate instead of Potassium Chloride as fertilizer?
Potassium Sulfate (SOP) is chloride-free and used for crops sensitive to chloride toxicity: tobacco, citrus, grapes, potatoes, stone fruits and berries. Potassium Chloride (MOP) is cheaper but introduces chloride which can reduce crop quality in sensitive species. SOP also provides sulfur nutrition.
What documents are available for Potassium Sulfate -– Chloride-Free Potassium & Sulfur Source orders?
COA and MSDS are standard for commercial discussions. COO, packing list, invoice and other import-support documents can be arranged according to order scope.
Can TCS Industries Limited support Potassium Sulfate -– Chloride-Free Potassium & Sulfur Source supply to South America?
Yes. We support B2B buyers in Argentina, Colombia, Chile, Peru, Ecuador, Uruguay, Bolivia, Brazil, Paraguay, Venezuela, Guyana and Suriname, subject to route and document review.
Do you support Europe, the United Kingdom, Australia, New Zealand, Mexico and Canada?
Yes. These destinations can be reviewed for project supply, import documents, packaging and logistics planning before quotation.
Is Potassium Sulfate permitted in organic farming?
Yes. Potassium Sulfate derived from natural mineral sources (e.g., langbeinite, brine processing) is permitted in organic farming under EU Regulation 2018/848 and USDA National Organic Program. Mannheim process SOP (from KCl + H₂SO₄) may not qualify for organic certification depending on the standard. Specify organic certification requirement at inquiry.
What is the chloride content limit for SOP?
Standard SOP typically contains ≤1.0% Cl. Premium low-chloride grades have ≤0.5% Cl. For pharmaceutical use, chloride limits follow USP-NF monograph specifications. Specify the maximum acceptable chloride level at inquiry based on crop sensitivity or formulation requirement.
Can you arrange samples before commercial purchasing?
Samples or evaluation quantities may be reviewed for qualified buyers after target specification, application and destination-market requirements are clarified.
How is Potassium Sulfate -– Chloride-Free Potassium & Sulfur Source packaged for export?
Packaging is confirmed by quantity and material properties. Typical options include foil bags, HDPE containers, fibre drums, 25 kg bags or palletized export packaging.
Can buyer-defined specifications be reviewed?
Yes. Send the specification, methods, impurity limits and required documents. TCS can review feasibility before confirming quotation and lead time.
What payment terms are normally used?
Standard payment is 100% T/T before dispatch unless a different arrangement has been approved for an established commercial account.
What lead time should buyers expect?
Lead time depends on stock, batch size, document scope and destination. Available stock can move faster; made-to-order or pallet programs require longer planning.
Is Potassium Sulfate used in pharmaceutical products?
Yes. K₂SO₄ is monographed in USP-NF and Ph.Eur. and listed in the FDA IID. It serves as a potassium source and tonicity adjuster. Pharmaceutical-grade material has tighter purity requirements than fertilizer grade. Specify pharma grade with applicable monograph reference at inquiry.
Last reviewed: June 2026
Evaluation and research orders (≤10 kg) are shipped with COA, MSDS, and certificate of origin. Bulk commercial orders (>10 kg) qualify for volume pricing with a full technical documentation package available on request.
> Request a Quote
If your team already has a target application, estimated quantity, destination market, or documentation requirements, send those details so the commercial response can be prepared more efficiently.