Antimony trioxide is a white fine powder with the main crystal structure as cubical shape. 1. It is widely used as a fire retardant in the membranes of plastics industry and the enclosures of electric devices and household electric appliances such as PVC, PP, PE, PS, ABS, PU, ect. 2. Used as filling, covering agents and retardants for rubber, ceramics, enamels, fabrics, and fiber products. 3. Used as colors and retardants in oil paint and coating material industry. 4. Used as retardants in synthetic resin and papers. 5. Used as catalytic agent in organic synthesis.