Antimony Oxide or Antimony Trioxide Sb2O3, with purity 99.99% and 99.999%, also called antimony white, dissolves in aqueous solutions only with hydrolysis and slightly soluble in water, it is a very fine white powder formed by vaporizing antimony metal in an oxidizing atmosphere.

Antimong Oxide is mainly for the manufacturing of other antimony compounds, flame-retardant in plastics, rubber, paints, paper, textiles, and electronics , and as a clarifying agent for glass, an opacifier for porcelain and enamel, a white pigment for paint, and also used chiefly for electronic elements, light proof agent for white pigment, mordant and high purity reagent.