Calcium sulfate, hemihydrate

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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;

Composition CaSO4-0.5H2O
CAS 7778-18-9
Melting Point 163
Density 2.5 - 2.7
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

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