Molekula
Calcium sulfate dihydrate
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 dihydrate, also known as gypsum, is a white crystalline powder used in construction, agriculture, and pharmaceuticals as a setting agent and filler. It is stable at ambient temperatures and poses no significant hazards. CAS: 10101-41-4, Molecular formula: CaO4S · 2H2O, Molecular weight: 172.17 g/mol. Molekula supplies calcium sulfate dihydrate 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
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 kg — £45.10 per pack ex VAT · £54.12 inc. VAT
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 crystalline powder |
| Heavy metals | ≤ 0.001% |
| Identification | Conforms to reference |
| Assay | ≥ 98.0% |
| Identification (IR) | Conforms to structure |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 100-150 °C |
| Vapour Pressure | 0 mmHg (approx) |
Source: PubChem CID 24928 (ICSC, The National Institute for Occupational Safety and Health (NIOSH))
Identification
| Property | Value |
|---|---|
| SKU | 48621651 |
| CAS Number | 10101-41-4 |
| IUPAC Name | calcium;sulfate;dihydrate |
| Molecular Formula | CaO4S · 2H2O |
| Molecular Weight | 172.17 |
| Exact Mass | 171.9354 |
| SMILES | O.O.[O-]S(=O)(=O)[O-].[Ca+2] |
| InChIKey | PASHVRUKOFIRIK-UHFFFAOYSA-L |
| InChI | InChI=1S/Ca.H2O4S.2H2O/c;1-5(2,3)4;;/h;(H2,1,2,3,4);2*1H2/q+2;;;/p-2 |
| PubChem CID | 24928 |
| REACH Code | Y113 |
| HTS Code | 2833.29.51.90 |
| Tariff Code | 2833298080 |
Safety & GHS
Precautionary statements
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, 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.
Synonyms
- Alabaster
- Annaline
- Compactrol
- Gypsum fibrosum
- Light spar
- Magnesia White
- Native calcium sulfate
- Precipitated calcium sulfate
- Satin spar
- Satinite
Frequently asked questions
What is calcium sulfate dihydrate used for?
It is commonly used as a soil amendment, in cement and plaster formulations, and as a food additive (E516) for pH control and as a firming agent.
What is the chemical formula and molecular weight?
The formula is CaO4S · 2H2O with a molecular weight of 172.17 g/mol.
How should calcium sulfate dihydrate be stored?
It should be stored at ambient temperature, in a dry, well-ventilated area, away from moisture.
What grade is available?
We offer reagent grade and technical grade; please specify your application for the appropriate grade.
Can Molekula supply it in bulk?
Yes, we can supply calcium sulfate dihydrate in bulk quantities—contact us for pricing and delivery options.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS); additional documentation is available upon request.
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.