Trimethylolpropane 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, thereby extending the material's lifespan. Additionally, it acts as an antioxidant, enhancing the durability and performance of polymers. In lubricants and greases, it serves as an anti-wear additive, reducing friction and protecting machinery components. Its application in coatings and adhesives improves resistance to environmental factors, ensuring long-term stability and quality.