Triphenyl phosphite is widely used as a stabilizer and antioxidant in the polymer industry, particularly for PVC, to prevent degradation caused by heat and light. It acts as a scavenger for free radicals and peroxides, enhancing the durability of plastic products. In organic synthesis, it serves as a reducing agent and a ligand in various catalytic reactions. It is also employed in the production of flame retardants and lubricant additives, improving the performance and safety of these materials. Additionally, triphenyl phosphite is utilized in the synthesis of organophosphorus compounds, which have applications in agrochemicals and pharmaceuticals. Its ability to modify and stabilize polymers makes it a valuable component in the manufacturing of coatings, adhesives, and elastomers.