Used as a photoinitiator in UV-curable systems, particularly in inks, coatings, and adhesives. It generates free radicals upon exposure to ultraviolet light, initiating polymerization of monomers and oligomers. Offers good solubility in various resin systems and effective curing under medium-pressure mercury lamps. Provides low yellowing and improved surface cure, making it suitable for clear coatings and pigmented formulations. Also used in 3D printing resins where controlled, rapid curing is required.