More than 80% of antimony trioxide is used as a flame retardant additive for various type of plastics, rubbers, and fibers, with the balance used mainly for polyester polymerization catalysts, variable resistors, decolorizing and fining of optical lenses, and as pigments.
The use of small quantities of antimony trioxide for plastics together with halogenated compound is a common and efficient method to obtain flame retardant effectiveness without detracting from the original properties of the plastics.
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