Molekula
Potassium sulfate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Potassium sulfate (K2SO4) is a water-soluble inorganic salt primarily used as a fertilizer to supply potassium and sulfur to crops, improving yield and soil health. It is also employed in industrial applications such as a food additive (E515) and in the production of glass and ceramics. CAS 7778-80-5, molecular weight 174.26 g/mol, stable at ambient storage with no signal word required. Molekula supplies potassium sulfate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White powder |
| Loss on Drying | ≤ 1.000% |
| Flame test | Lilac flame |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless or white crystals, or white granules or powder |
| Odour | Odorless |
| Melting Point | 1067 °C |
| Boiling Point | 1689 °C |
| Solubility (other solvents) | Freely soluble in water, insoluble in ethanol |
| Refractive Index | 1.494 |
Source: PubChem CID 24507 (HSDB, ICSC, EU Food Improvement Agents)
Identification
| Property | Value |
|---|---|
| SKU | 90033603 |
| CAS Number | 7778-80-5 |
| IUPAC Name | dipotassium;sulfate |
| EC Number | 231-915-5 |
| Molecular Formula | K2SO4 |
| Molecular Weight | 174.26 |
| Exact Mass | 173.8791 |
| SMILES | [O-]S(=O)(=O)[O-].[K+].[K+] |
| InChIKey | OTYBMLCTZGSZBG-UHFFFAOYSA-L |
| InChI | InChI=1S/2K.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2 |
| PubChem CID | 24507 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 31051000 |
| Tariff Code | 3105100090 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- Arcanum duplicatum
- Dipotassium sulfate
- Kali sulphuricum
- Kalium sulphuricum
- Potassium (as sulfate)
- Potassium sulfate (K2(SO4))
- Potassium sulphate
- Sulfuric acid dipotassium salt
- Sulfuric acid potassium salt (1:2)
- Tartarus vitriolatus
Frequently asked questions
What is potassium sulfate commonly used for?
Potassium sulfate is primarily used as a fertilizer to supply potassium and sulfur to plants, improving crop yield and quality, and is also used in the production of glass, matches, and as a food additive (E515).
What is the chemical formula and molecular weight of potassium sulfate?
The chemical formula is K₂SO₄, and the molecular weight is 174.26 g/mol.
How should potassium sulfate be stored?
Store potassium sulfate in a cool, dry, and well-ventilated area at ambient temperature, away from moisture and incompatible substances.
What grades of potassium sulfate does Molekula supply?
Molekula supplies potassium sulfate to a specification covering appearance (white powder), loss on drying (≤ 1.000%) and flame test (lilac flame). No specific grade designation is stated in the specification.
Can Molekula supply potassium sulfate in bulk quantities?
Yes, Molekula can supply potassium sulfate in bulk quantities (e.g., 25 kg bags, 1-tonne containers, or custom packaging) for industrial and commercial use.
What documentation comes with a potassium sulfate order?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.