Triisodecyl phosphite is widely used as a stabilizer in the polymer industry, particularly in the production of PVC and other plastics. It helps prevent degradation caused by heat, light, and oxidation during processing and storage, ensuring the material retains its properties over time. Additionally, it acts as a secondary antioxidant in lubricants and oils, enhancing their performance and extending their lifespan by inhibiting oxidation. In the rubber industry, it is employed to improve the aging resistance of synthetic rubbers, maintaining their flexibility and durability. Its applications also extend to adhesives and coatings, where it contributes to stability and prevents discoloration or breakdown under harsh conditions.