Antimony trioxide (CAS 1309-64-4)


Antimony trioxide (CAS 1309-64-4)

Antimony(III) oxide is the inorganic compound with the formula Sb2O3. It is the most important commercial compound of antimony. It is found in nature as the minerals valentinite and senarmontite. Like most polymeric oxides, Sb2O3 dissolves in aqueous solutions with hydrolysis. A mixed arsenic-antimony oxide occurs in the nature as the very rare mineral stibioclaudetite.

Antimony(III) oxide is an amphoteric oxide, it dissolves in aqueous sodium hydroxide solution to give the meta-antimonite NaSbO2, which can be isolated as the trihydrate. Antimony(III) oxide also dissolves in concentrated mineral acids to give the corresponding salts, which hydrolyzes upon dilution with water. With nitric acid, the trioxide is oxidized to antimony(V) oxide.

When heated with carbon, the oxide is reduced to antimony metal. With other reducing agents such as sodium borohydride or lithium aluminium hydride, the unstable and very toxic gas stibine is produced. When heated with potassium bitartrate, a complex salt potassium antimony tartrate, KSb(OH)2•C4H2O6 is formed.

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25 kg bag



Industries: Glass and ceramics, Resins, plastics, polyurethanes
CAS number: 1309-64-4
WE number: 215-175-0
Chemical formula: Sb2O3
Molar mass: 291,52 g/mol
Customs tariff code: 28258000

Other physical properties

Melting / freezing point: 656°C (1013 hPa)
Boiling point / range: 1425°C (1013 hPa)
Relative density: 5897 kg/m3 (20°C )
Solubility in water: 2,76 mg/l (22,2°C )

Additional information

Dimensions N/A
Available amount

25 kg bag