Used as a stabilizer in polymers to protect against degradation caused by UV light and oxidation. Commonly added to plastics, coatings, and adhesives to extend service life. Effective in preventing yellowing and loss of mechanical strength in polyolefins, polyurethanes, and acrylics exposed to outdoor conditions. Also utilized in cosmetic formulations to enhance the stability of light-sensitive ingredients. Frequently combined with other antioxidants and UV absorbers for synergistic effects in high-performance materials.