Antioxidant 626. Antioxidant is a kind of plastic additive which can effectively reduce the self-oxidation reaction speed of plastic materials and delay the aging and degradation of plastic materials. Among them, antioxidant 626 is a phosphite auxiliary antioxidant, which is updated on the premise of antioxidant 225. It is an efficient and transparent organic synthetic antioxidant and polymerization inhibitor with low volatility, which is widely used in the synthesis and processing of various plastics such as polypropylene, polyethylene, ABS, polycarbonate fiber and polyester resin.