Used as an antioxidant in polymers, lubricants, and fuels to prevent degradation caused by oxidation. It protects materials from thermal and oxidative stress, extending service life. Commonly added to rubber, plastics, and synthetic lubricants to maintain performance and stability under high temperatures. Also found in transformer oils and industrial greases where long-term oxidation resistance is critical. Effective in low concentrations and compatible with a variety of organic matrices.