Used as a high-performance light stabilizer in polymers, especially in polyolefins, polyurethanes, and engineering plastics. It protects materials from UV degradation, preventing yellowing, cracking, and loss of mechanical strength. Commonly added to automotive parts, outdoor coatings, films, and fibers where long-term weatherability is required. Also effective in transparent polymers due to low color contribution. Shows excellent compatibility and thermal stability during processing and in end-use applications.