Phosphorus pentasulfide

Phosphorus pentasulfide (CAS 1314-80-3, EC 215-242-4), also known as P4S10, phosphorus sulfide, and phosphoric sulfide, is an inorganic compound formed by the reaction of phosphorus and sulfur. It carries no assigned E-code and is classified under HS code 28139000 within the inorganic acids category.

In lubricant formulation, phosphorus pentasulfide reacts with alcohols or hydrocarbons to produce zinc dialkyldithiophosphate (ZDDP) and similar antiwear additives, which form protective films on metal surfaces under high-pressure conditions. In mining and mineral processing, it serves as a flotation reagent precursor, and in agrochemical synthesis it acts as a sulfur-transfer agent in the production of organophosphate pesticides.

Phosphorus pentasulfide is supplied as a technical-grade crystalline solid and is subject to REACH registration requirements for European procurement. Packaging typically follows hazardous goods standards given its reactivity with moisture. Buyers should confirm lot-specific documentation and SDS compliance prior to ordering.