Used primarily as an antioxidant in polymers and plastics, protecting materials from degradation caused by heat, light, and oxygen exposure. Effective in polyolefins, synthetic rubbers, and adhesives, where it prevents discoloration and maintains mechanical properties during processing and long-term use. Also employed in lubricants and fuels to inhibit oxidation and extend service life. Its sterically hindered structure provides high thermal stability, making it suitable for high-temperature processing applications.