Antimony Trioxide Sb2O3 is a white powder flame retardant and additive used in plastics like PVC, PP, and PE. It has high flame retarding ability while having less influence on the mechanical properties of base materials. It is also used as a filler and flame retardant in rubber, and as a covering agent and whitening agent in enameled and ceramic products. It has a molecular weight of 291.5 g/mole and is packaged in 25kg bags made of kraft paper with a polyethylene inner lining.