This product is colorless or light yellow transparent liquid, its melting point is lower than 10ºC. It can be dissolved in solvents such as benzene, acetone, ethyl acetate, methanol, insolube in water. This product is kind of liquid hindered phenolic antioxidant, sutiable for polymers. Especially suitable for flexible polyurethane foam sheet, it is possible to prevent generation of peroxide during storage of the polyol. It can also prevent scorching occours during the foaming process. Due to the low volatility and excellent compatibility, it is particularly effective in the process of the polyurethane useed in the forced air cooling. Low voaltility and a liquid state of the product in a single liquid, emulsion. suspension, solution or melt of polymer manufacturing and processing is particularly useful. It is easy to emulsify, it can be added before polymerization, during and after polymerizattion process. It shows good synergistic operative effects when bring used together with the liquid amine antioxidants, the liquid thioesters antioxidants DTDTP. The general using rate is 0.15%-0.5%.