Difference between revisions of "Calcium sulfate, hemihydrate"
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== Description == | == Description == | ||
| − | Fine-grain, odorless powder commonly called [http://cameo.mfa.org/materials/fullrecord.asp?name=plaster | + | Fine-grain, odorless powder commonly called [http://cameo.mfa.org/materials/fullrecord.asp?name=plaster%20of%20Paris plaster of Paris]. Hemihydrate calcium sulfate is made by partially calcining [http://cameo.mfa.org/materials/fullrecord.asp?name=gypsum 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 == | == Synonyms and Related Terms == | ||
Revision as of 06:28, 24 July 2013
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