tri-Sodium phosphate

Trisodium phosphate (TSP) is the inorganic compound with the chemical formula Na₃PO₄. It is a white, granular or crystalline solid, highly soluble in water, producing an alkaline solution. TSP is used as a cleaning agent, builder, lubricant, food additive, stain remover, and degreaser.

The item of commerce is often partially hydrated and may range from anhydrous Na₃PO₄ to the dodecahydrate Na₃PO₄ • 12H₂O. Most often found in white powder form, it can also be called trisodium orthophosphate or simply sodium phosphate