Calcium sulfate
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Description
Commonly found in three forms: anhydrous (Anhydrite), dihydrate (Gypsum) and hemihydrate (Plaster of Paris). Anhydrite is a colorless, inert pigment which is often used as a paper filler. Calcium sulfate dihydrate is used in the manufacture of portland cement. Gypsum is also used as a filler and pigment in paints, enamels, glazes, and paper. Plaster of Paris is used for wall plaster, wallboard, moldings, and statuary.
Synonyms and Related Terms
anhydrite; gypsum; plaster; terra alba; alabaster; calcium sulphate (Br.); mineral white; crown filler; alabastine; pearl filler
Other Properties
Particle size = 0.2 micrometers
| Composition | CaSO4 |
|---|---|
| CAS | 10101-41-4 |
| Molecular Weight | mol. wt. = 136.14 |
| Refractive Index | 1.21; 1.52; 1.53 |
Hazards and Safety
Noncombustible
Comparisons
Characteristics of Common White Pigments
Sources Checked for Data in Record
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1753
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
- Thomas B. Brill, Light Its Interaction with Art and Antiquities, Plenum Press, New York City, 1980 Comment: ref. index = 1.21; 1.52; 1.53