Used primarily as a photoinitiator in UV-curable systems, enabling rapid polymerization of inks, coatings, and adhesives upon exposure to ultraviolet light. It is especially effective in clear coatings and printing inks where good light penetration is required. Its ability to generate free radicals under UV light makes it suitable for radical polymerization reactions in oxygen-sensitive environments. Commonly found in industrial printing, electronics, and dental materials where fast curing and low yellowing are important.