Nomenclature
CAS number: 1314-35-8
Tungsten oxide (WO
3); tungstic anhydride.
O
3W; mol wt 231.84.
O 20.70%, W 79.30%.
WO
3.
Description and 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.