Tris(2-ethylhexyl) phosphite is widely used as a stabilizer in the polymer industry, particularly for PVC and other vinyl polymers. It helps to prevent degradation caused by heat, light, and oxidation during processing and storage, thereby extending the lifespan of the materials. Additionally, it acts as a secondary antioxidant in lubricants and oils, enhancing their performance by reducing oxidation and maintaining viscosity. In the rubber industry, it is employed to improve the aging resistance of synthetic rubbers. Its ability to chelate metal ions also makes it useful in preventing metal-catalyzed degradation in various industrial applications.