Used primarily as a photoinitiator and UV stabilizer in polymer systems. It helps prevent degradation caused by ultraviolet light in coatings, adhesives, and dental resins. Its functional groups enable covalent bonding into the polymer network during curing, reducing leaching and improving long-term stability. Commonly found in UV-curable inks, protective coatings, and medical-grade polymers where durability and resistance to yellowing are critical. Also employed in some lens materials and electronic encapsulants to enhance weatherability and maintain optical clarity under prolonged UV exposure.