Sodium tripolyphosphate or Sodium triphosphat which is commonly referred as STPP, is a type of inorganic compound. Its chemical formula is Na₅P₃O₁₀. It is in reality the sodium salt of polyphosphate penta-anion. It is widely used to treat hard water for its good softening properties. It acts as a surfactant with unique emulsification capacity. Available in white powder form, this item is known for its high melting point, low alkalinity level, anti corrosion feature and it is accessible in different density range. We would like to introduce ourselves as a well known trader, supplier and exporter of good quality STPP.


  • Its alkaline content does not cause corrosion
  • High emulsification properties
  • White powder form
  • Cost effectiveness


  • Cas No : 7758-29-4
  • Formula: Na5P3O10
  • Molar mass: 367.864 g/mol
  • Melting point: 622 °C
  • Density: 2.52 g/cm³
  • Appearance: white powder
  • IUPAC name:  Pentasodium triphosphate
  • Alternate name : sodium tripolyphosphate, polygon, STPP Identifiers