Trioctyl phosphite is primarily used as a stabilizer and antioxidant in polymers, particularly in the production of PVC and other plastics. It helps prevent degradation caused by heat, light, and oxidation during processing and storage, extending the material's lifespan. In the rubber industry, it acts as a secondary antioxidant, enhancing the performance of primary antioxidants and improving the durability of rubber products. Additionally, it is employed as a lubricant additive to reduce friction and wear in machinery, improving efficiency and longevity. Its application in coatings and adhesives also ensures better resistance to environmental factors, maintaining product quality over time.