Calcium sulfate, hemihydrate
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Description
Fine-grain, odorless powder commonly called Plaster of Paris. Hemihydrate calcium sulfate is 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
plaster of Paris; dried calcium sulfate; dried gypsum; plaster;
| Composition | CaSO4-0.5H2O |
|---|---|
| CAS | 7778-18-9 |
| Melting Point | 163 |
| Density | 2.5 |
| Molecular Weight | mol. wt. = 145.15 |
Hazards and Safety
Ingestion may be harmful.
Mallinckrodt Baker: MSDS
Sources Checked for Data in Record
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1753