Used primarily as a photoinitiator in UV-curable systems such as inks, coatings, and adhesives. It is especially effective in free radical polymerization processes where rapid curing under ultraviolet light is required. Commonly found in printing inks and electronic coatings due to its ability to initiate curing at lower energy levels and provide deep cure even in pigmented formulations. Also used in some dental composites and 3D printing resins for its efficient initiation and stability.