Widely used as a secondary antioxidant in polymers, especially in polyolefins such as polyethylene and polypropylene. It protects materials from thermal and oxidative degradation during processing and extends service life by preventing discoloration and maintaining mechanical properties. Effective in high-temperature applications due to its high molecular weight and low volatility. Commonly used in wire and cable compounds, films, and molded parts where long-term stability is required. Also functions as a sulfur donor in some rubber vulcanization systems, improving crosslink efficiency and aging resistance.