Antioxidant 168 (Tris(2,4-di-tert-butylphenyl) phosphite) is a high-performance solid organophosphite secondary antioxidant. As an essential additive in the processing of polymer materials, Antioxidant 168 is widely used for stabilization treatment during the processing of polyolefins, polycarbonates, ABS, and other materials, owing to its low volatility, excellent thermal stability, and outstanding hydrolysis resistance. The core mechanism of action of Antioxidant 168 lies in its ability to efficiently decompose hydroperoxides generated by thermal oxidation during material processing, thereby inhibiting the degradation chain reaction of polymers.