Trisodium phosphate (TSP) is the inorganic compound with the chemical formula Na3PO4. It is a white, granular or crystalline solid and is highly soluble in an alkaline solution. TSPs are used as a cleaning agent, lubricant, food additive, stain remover and degreaser.
The element of commerce is most often partially hydrated and can range from anhydrous Na3PO4 to dodecehydrate Na3PO4.12H20. It is most commonly found in the form of a white powder, trisodium orthophosphate or simply sodium phosphate.