Used as a photoinitiator in water-based UV-curable systems, particularly in inks, coatings, and adhesives. Its sulfonate group provides good water solubility, making it suitable for eco-friendly formulations that require low organic solvent content. It enables rapid polymerization under UV light, offering efficient curing on heat-sensitive substrates. Commonly applied in digital printing and paper coatings where fast drying and high clarity are needed. Also utilized in some biomedical applications due to its solubility and reactivity under mild conditions.