Antimony Trioxide is an inorganic compound with the formula Sb2O3,
CAS No.1309-64-4. 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 only with hydrolysis.
The main application is for flame retardants in combination with halogenated materials. The combination of the halides and the antimony being key to the flame-retardant action for polymers, helping to form less flammable chars. Such flame retardants are found in electrical apparatus, textiles, leather and coatings.
- Antimony trioxide is a useful catalyst in the production of polyethylene terephthalate (PET) and the vulcanization of rubber.
- Antimony trioxide is an opacifying agent for glasses, ceramics and enamels.
- Some specialty pigments contain antimony.
- Flame retardant for textiles, leather, polymers, and coatings.
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