Molekula
Calcium sulfate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Calcium sulfate is an inorganic compound commonly used as a desiccant, in plaster of Paris, as a soil amendment, and in medical applications like casts and dental molds. It is also used in the production of cement and as a food additive (E516). This white crystalline solid has a CAS number of 7778-18-9, a molecular formula of CaSO₄, and a molecular weight of 136.14 g/mol. It can be stored safely at ambient conditions and poses no hazard classification, requiring no signal word. Molekula supplies calcium 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 |
| Assay | >99% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Sol anhydrite is obtained in granular or powder form |
| Odour | Pure anhydrous calcium sulfate is odorless |
| Melting Point | 1450 °C |
| Solubility (other solvents) | Slightly soluble in water, insoluble in ethanol |
| Vapour Pressure | 0 mmHg (approx) |
| Refractive Index | 1.521 |
Source: PubChem CID 24497 (HSDB, EU Food Improvement Agents, The National Institute for Occupational Safety and Health (NIOSH))
Identification
| Property | Value |
|---|---|
| SKU | 73833962 |
| CAS Number | 7778-18-9 |
| IUPAC Name | calcium sulfate |
| EC Number | 231-900-3 |
| Molecular Formula | CaSO4 |
| Molecular Weight | 136.14 |
| Exact Mass | 135.9143 |
| SMILES | [O-]S(=O)(=O)[O-].[Ca+2] |
| InChIKey | OSGAYBCDTDRGGQ-UHFFFAOYSA-L |
| InChI | InChI=1S/Ca.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 |
| PubChem CID | 24497 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 25201000 |
| Tariff Code | 2520100000 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
Documents
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.
Synonyms
- Anhydrous gypsum
- Basic calcium sulfate
- Calcium sulfate, anhydrous
- calcium sulphate
- Crysalba
- Drierite
- Karstenite
- Muriacite
- Osteoset
- Thiolite
Frequently asked questions
What is calcium sulfate commonly used for?
Calcium sulfate (anhydrous or hemihydrate) is widely used in construction as plaster of Paris, in agriculture as a soil amendment, and in industrial applications like a desiccant or filler in paints and adhesives.
What is the chemical formula and molecular weight of calcium sulfate?
The chemical formula is **CaSO₄**, and the molecular weight is **136.14 g/mol** (anhydrous form).
How should calcium sulfate be stored?
Store calcium sulfate in a cool, dry place at **ambient temperature**, protected from moisture to prevent clumping or degradation.
What grades or purity levels of calcium sulfate does Molekula supply?
Molekula supplies **technical-grade calcium sulfate** (anhydrous or hemihydrate) with purity levels typically ≥95% for industrial applications. Custom grades may be available upon request.
Can Molekula supply calcium sulfate in bulk quantities?
Yes, Molekula can supply calcium sulfate in **bulk quantities** (e.g., 25 kg bags, 1-tonne supersacks, or custom packaging) for large-scale industrial or commercial use.
What documentation is provided with a calcium sulfate order?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS)**, and **batch-specific documentation** for traceability and compliance.
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.