4'-Hydroxyacetophenone

4'-Hydroxyacetophenone (CAS 99-93-4), also known commercially as Piceol, p-Acetylphenol, and 4-Acetylphenol, is a phenolic ketone classified as a pharmaceutical intermediate. It carries no assigned E-code and is registered under EC 202-802-8, with HS code 29145000 for customs classification across EU trade.

In UV-curable systems, it functions as a photoinitiator by absorbing UV radiation and generating reactive species that trigger polymer crosslinking. In personal care and food formulations, its phenolic hydroxyl group scavenges free radicals, providing antioxidant stabilization, while its mild acetophenone character contributes floral, hay-like notes as a fragrance or flavor component.

This material is supplied as a pharmaceutical-grade crystalline powder compliant with REACH registration requirements. Buyers should confirm suitability against Ph.Eur. or FCC monographs depending on the intended application. Standard packaging formats for European B2B supply typically include 25 kg fiber drums or multi-layer bags.