Tungsten Trioxide
Title: Tungsten Trioxide
CAS Registry Number: 1314-35-8
CAS Name: Tungsten oxide (WO3)
Additional Names: tungstic anhydride
Molecular Formula: O3W
Molecular Weight: 231.84
Percent Composition: O 20.70%, W 79.30%
Line Formula: WO3
Literature References: Prepn from sodium tungstate: Hein, Herzog, in Handbook of Preparative Inorganic Chemistry vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) pp 1423-1424. Review of toxicology and human exposure: Toxicological Profile for Tungsten (PB2006-100007, 2005) 203 pp.
Properties: Canary yellow, heavy powder; dark orange when heated, regaining the original color on cooling. Insol in water. Sol in caustic alkalies; very slightly sol in acids.
Use: Manuf tungstates which are used for x-ray screens and for fireproofing fabrics.

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