Difference between revisions of "Calcium sulfate, hemihydrate"
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== Description == | == 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. | + | 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 == | == Synonyms and Related Terms == | ||
| − | plaster of Paris; dried calcium sulfate; dried gypsum; plaster; | + | bassanite; plaster of Paris; dried calcium sulfate; dried gypsum; plaster; |
{| class="wikitable" | {| class="wikitable" | ||
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|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2.5 | + | | 2.5 - 2.7 |
|- | |- | ||
! scope="row"| Molecular Weight | ! scope="row"| Molecular Weight | ||
Revision as of 08:01, 8 June 2018
Description
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