Used primarily as a photoinitiator in UV-curable inks, coatings, and adhesives. It absorbs ultraviolet light to generate free radicals that initiate polymerization, enabling fast curing under UV exposure. Commonly found in printing inks for packaging and industrial coatings where rapid drying and strong film formation are required. Also utilized in some specialty polymers to enhance light sensitivity during manufacturing processes. Its high absorption in the UV range makes it effective in thin-film applications.