The product takes on an appearance of white crystalline powder or grains. The melt point ranges from 160 C to 180 C. Flash point: 168 C. kindling point: 421 C. stacking density: 0.43g/mL. lower limit concentration of dust explosion: 0.12Kg/m3. explosion index: 0.37. soluble in organic solvents like toluene, dichloromethane, and slightly soluble in alcohols but insoluble in water. The product is a kind of high-effective solid phosphite ester antioxidant, which is superior to other phosphite ester in the effective protection of polymers' color. It is often blended with phenolic principal antioxidant (such as AT-10) to prepare composite antioxidant which improves the thermo-stability of polymer processing, thus making it widely applied in PE, PP, PS, PA, PC, ABS and many other polymer materials.