Calcium hypochlorite

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A white, crystalline solid. Calcium hypochlorite is a strong oxidizing bleach. It has been used in weak concentrations (0.5%) to bleach textiles and Paper although it may leave traces or residual chloride. It is also used as a Bactericide, Fungicide, and Disinfectant.

Synonyms and Related Terms

calcium hypochloride; bleaching powder; chloride of lime; calcium oxychloride; calcium salt of hypochlorous acid; Losantin; chlorinated lime

Chemical structure

Calcium hypochlorite.jpg

Hazards and Safety

Toxic chlorine gas may form when mixed with acids or ammonia.

Fire risk in contact with organic materials.

Severely corrosive to skin tissue on contact, inhalation, or ingestion.

The presence of trace heavy metals or their salts can accelerate oxidation.

Flinn Scientific: SDS

Physical and Chemical Properties

Decomposes in water and ethanol.

Composition Ca(OCl)2
CAS 7778-54-3
Density 2.35
Molecular Weight mol. wt. = 142.98

Resources and Citations

  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002
  • Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
  • Hermann Kuhn, Conservation and Restoration of Works of Art and Antiquities, Butterworths, London, 1986
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
  • Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1648

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