Calcium sulfate

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Calcium sulfate


Calcium sulfate

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.

See more information on the pages for each form of hydration.

Synonyms and Related Terms

anhydrite; gypsum; plaster; terra alba; alabaster; calcium sulphate (Br.); mineral white; crown filler; alabastine; pearl filler


  • Noncombustible

Physical and Chemical 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


Characteristics of Common White Pigments

Resources and Citations

  • 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