Trihexyl phosphite is widely used as a stabilizer and antioxidant in the polymer industry. It helps prevent the degradation of plastics and synthetic rubbers caused by heat, light, and oxidation during processing and storage. This chemical is particularly effective in polyolefins, such as polyethylene and polypropylene, enhancing their durability and extending their lifespan. Additionally, it serves as a ligand in organometallic chemistry, facilitating various catalytic reactions. In lubricants and hydraulic fluids, trihexyl phosphite acts as an anti-wear additive, reducing friction and protecting machinery components. Its ability to scavenge free radicals also makes it valuable in the formulation of high-performance coatings and adhesives.