... in organic synthesis 3.Used as retardants in synthetic resin Antimony Trioxide1.Chemical name: Diantimony trioxideMolecular Formula: Sb2O3CAS NO. 1309-64 ... .1µm0.7-1.3µm4.Usage:1) Antimony trioxideTtrioxide used as a fire retardant in the membranes of plastics industry and the ... such as PVC,PP ,PE ,PS ,ABS,PU ,etc:2).Antimony trioxide is used as filling, covering agents and retardants for rubber ...