Product Description Trisodium Phosphate/ TSP CAS No.: 7601-54-9 E Number: E339 Molecular formula: Na3PO4Â • 12H2O Properties: White or colorless crystals, efflorescent in air, easily soluble in water but not in organic solution. Its water solution is alkaline. Uses: Used as a water softening agent, cleaning agent in electroplating, color fixer in fabric dyeing and flux in enamel ware manufacturing and so on. For more details, contact me.