Used primarily as a photoinitiator in UV-curable formulations such as inks, coatings, and adhesives. It absorbs UV light efficiently and generates free radicals that initiate polymerization of acrylate monomers. Commonly found in printing inks and clear coatings where low yellowing and good surface cure are required. Also used in some dental composites and 3D printing resins due to its reactivity under UV exposure. Shows good performance in thin films and works well in combination with co-initiators like tertiary amines to enhance curing speed.