Used primarily as a photoinitiator in UV-curable formulations such as inks, coatings, and adhesives. It absorbs ultraviolet light to generate free radicals, initiating rapid polymerization of monomers and oligomers. Commonly found in printing inks and clear coatings where low yellowing and high reactivity are required. Also utilized in some dental composites and 3D printing resins due to its efficient curing under UV light. Shows good solubility in organic matrices and supports surface-cure performance in thin films.