Calcium chloride

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The anhydrous form of calcium chloride is very hygroscopic. It is used as a desiccant. Calcium chloride also exists as dihydrate and hexahydrate crystals. These crystalline forms are used in antifreeze solutions, fire extinguishers, fireproofing solutions, wood preservatives, as a gelling agent for starch size and to melt snow and ice from roads. Calcium chloride was used to speed up the rate of cure in mortar, shotcrete, and dry-mix concrete until 1973 when it was replaced by a non-chloride accelerator because it corroded steel reinforcements.

Chemical structure

Calcium chloride.jpg

Other Properties

Soluble in water (with the evolution of heat). pH = 8 - 9

Composition CaCl2
CAS 10043-52-4
Melting Point 772
Density 2.152
Molecular Weight mol. wt. = 110.98
Boiling Point >1600

Hazards and Safety

Contact may cause irritation. International Chemical Safety Card

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 140
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
  • Thomas C. Jester (ed.), Twentieth-Century Building Materials, McGraw-Hill Companies, Washington DC, 1995
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1630