antimony trioxide used as fire retardant,filling, covering agents and retardants,pigments and retardant ,catalytic agent etc. Application1.Used as a fire retardant in the membranes of plastic industry, the enclosures of electric devices and household electric appliances, such as PVC,PP ,PE ,PS ,ABS,PU ,etc..2. Used as filling, covering agents and retardants for rubber, ceramics, enamels, fabrics, ...