View source for Calcium sulfate, hemihydrate

== 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;

{| class="wikitable"
|-
! scope="row"| Composition
| CaSO4-0.5H2O
|-
! scope="row"| CAS
| 7778-18-9
|-
! scope="row"| Melting Point
| 163
|-
! scope="row"| Density
| 2.5
|-
! scope="row"| Molecular Weight
| mol. wt. = 145.15
|}

== Hazards and Safety ==

Ingestion may be harmful.  

Mallinckrodt Baker: [http://www.jtbaker.com/msds/englishhtml/c0499.htm MSDS]

== Authority ==

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



[[Category:Materials database]]