Title: Antimony Pentoxide

CAS Registry Number: 1314-60-9

Additional Names: Antimonic oxide; "stibic" anhydride; antimonic "acid"

Molecular Formula: O5Sb2

Molecular Weight: 323.52

Percent Composition: O 24.73%, Sb 75.27%

Line Formula: Sb2O5

Literature References: Prepn: Schenk in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 616. Toxicity study: W. R. Bradley, W. G. Fredrick, Ind. Med. 10, Ind. Hyg. Sect. 2, 15 (1941).

Properties: Yellowish powder. Cubic. d 3.78. Loses oxygen at 300° or higher. Studies have shown that the compound does not correspond fully to Sb2O5, but that it is always somewhat hydrated. Slightly soluble in water. Practically insol in HNO3. Slowly dissolves in warm HCl or in warm KOH soln. LD50 i.p. in rats: 400.0 mg Sb/100 g (Bradley, Fredrick).

Density: d 3.78

Toxicity data: LD50 i.p. in rats: 400.0 mg Sb/100 g (Bradley, Fredrick)

Use: Fire retardant in clothing.