Used as an antioxidant in rubber and polymer materials to prevent degradation caused by oxygen and ozone. Protects against thermal aging in tires, hoses, belts, and other rubber goods. Commonly added during manufacturing to extend service life and maintain elasticity and strength. Also found in lubricants and greases to inhibit oxidation and reduce sludge formation. Effective in protecting unsaturated polymers and natural rubber compounds exposed to high temperatures and dynamic stress.