Calcium silicate

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Any of the silicates of calcium. Calcium silicate occurs naturally in several minerals: wollastonite, diopside, anorthite, lawsonite and tremolite. Calcium silicates are used in the manufacture of glass, porcelain, molecular sieves, wallboard, and portland cement. Wollastonite is used as a bubble-free white opacifier in glazes. Calcium silicates are also used as fillers for paper and plastics. In general, they are highly absorbent.

Synonyms and Related Terms

tabular spar; calcium metasilicate; wollastonite; diopside; anorthite; tremolite; lawsonite; portland cement

Other Properties

Forms gel with acids. Insoluble in water but can absorb up to 6 times its weight of water.

Composition CaSiO3
CAS 1344-95-2
Density 2.9

Hazards and Safety

Inhalation of dust causes irritation.

Sources Checked for Data in Record

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1749