Used as a photoinitiator in UV-curable systems, enabling rapid polymerization of inks, coatings, and adhesives upon exposure to ultraviolet light. Its strong absorption in the long-wavelength UV range makes it effective in formulations requiring deep cure and good surface hardness. Commonly found in printing inks, electronic coatings, and dental materials where efficient curing under low-intensity UV sources is needed. Also valued for low yellowing and good compatibility with acrylate-based resins.