Widely used as an antioxidant in plastics, rubber, and synthetic fibers to prevent degradation caused by heat, light, and oxygen. It stabilizes polymers during processing and extends the service life of products exposed to high temperatures. Commonly added to polyolefins, polystyrene, and ABS resins. Also effective in lubricants and oils to inhibit oxidation and sludge formation. Its high thermal stability makes it suitable for industrial applications requiring long-term protection against aging.