Calcium sulfate

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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.

Calcium sulfate

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



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