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

Authority

  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1753

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