Used primarily as a photoinitiator in UV-curable systems such as inks, coatings, and adhesives. It generates free radicals upon exposure to ultraviolet light, initiating rapid polymerization of acrylate and methacrylate monomers. Commonly found in dental composites and 3D printing resins due to its efficient curing properties and low yellowing tendency. Also employed in screen printing inks and clear coatings where good surface cure and low odor are required.