Used as a light stabilizer in polymers, especially in polyolefins like polyethylene and polypropylene. It protects materials from degradation caused by UV radiation and oxidative stress, helping to maintain color, strength, and flexibility over time. Commonly added to agricultural films, packaging films, and outdoor plastics where long-term weather resistance is required. Also found in coatings and adhesives to improve durability under sunlight exposure. Works well in combination with other stabilizers, such as antioxidants, for enhanced protective effects.