Boric oxide

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A colorless crystalline compound used in metallurgy and in the manufacture of heat-resistant (borosilicate) glassware. Boric oxide is obtained from Boric acid, Borax, Sodium borate, or Colemanite. It is used in combination with silica as a flux for glazes.

Synonyms and Related Terms

boron oxide; boric anhydride; boron trioxide; boron sesquioxide

Chemical structure

Boric oxide.jpg



Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in ethanol, hot water.

Composition B2O3
CAS 1303-86-2
Melting Point 450 C
Density 2.46 g/ml
Molecular Weight mol. wt. = 69.6
Boiling Point 1500 C

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Henry Hodges, Artifacts: An Introduction to Early Materials and Technology, Ronald P. Frye, Kingston, Canada, 1988
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997

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