Calcium sulfate, hemihydrate
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Description
Fine-grain, odorless powder commonly called Plaster of Paris. Hemihydrate calcium sulfate naturally occurs as the mineral bassanite, but is commonly made by partially calcining Gypsum. When mixed with water, plaster of Paris will dry to a hard mass. It is used for wall plasters, wallboard, moldings, and statuary.
Synonyms and Related Terms
bassanite; plaster of Paris; dried calcium sulfate; dried gypsum; plaster;
Risks
- Ingestion may be harmful.
- Anmol Chemicals: SDS
Physical and Chemical Properties
| Composition | CaSO4-0.5H2O |
|---|---|
| CAS | 7778-18-9 |
| Melting Point | 163 C |
| Density | 2.5 - 2.7 g/ml |
| Molecular Weight | mol. wt. = 145.15 |
Resources and Citations
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1753