• Sodium tripolyphosphate

Sodium tripolyphosphate

  • CasNo:7758-29-4
  • Purity:99%

Product Details;

CasNo: 7758-29-4

Molecular Formula: Na5P3O10

Appearance: white or colourless crystals, granules or powder

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  • Molecular Formula:Na5P3O10
  • Molecular Weight:367.86
  • Appearance/Colour:white or colourless crystals, granules or powder 
  • Vapor Pressure:<0.1 hPa (20 °C) 
  • Melting Point:622 °C 
  • PSA:214.40000 
  • Density:>1.5 g/cm3 (20oC) 
  • LogP:1.49640 

Sodium tripolyphosphate(Cas 7758-29-4) Usage


Sodium tripolyphosphate (STPP) is an inorganic compound and the sodium salt of the polyphosphate penta-anion, derived from triphosphoric acid. Known by various names such as sodium triphosphate, pentasodium salt, or triphosphoric acid, STPP is a colorless, alkaline salt. This versatile compound is widely used in both domestic and industrial products. While sodium phosphate is generally considered safe by the FDA, individuals with kidney disease may need to exercise caution regarding sodium phosphate intake, and consultation with a healthcare professional is recommended in such cases. The multifaceted properties of STPP make it a valuable ingredient in various industrial and consumer applications.


In the food industry, Sodium tripolyphosphate (STPP) is employed as a food additive to enhance the texture and water-holding capacity of meat products. It serves as a chelating agent, adjusting pH levels, increasing ionic strength, and forming hydrates. Additionally, STPP is utilized in the production of synthetic detergents, where it plays a vital role in preventing calcium phosphate scale formation, emulsifying fats and oils, and dispersing solid dirt. Its strong chelating ability is particularly valuable in preventing the buildup of scale by complexing calcium ions, thereby improving the efficiency of cooling systems. Moreover, STPP finds applications in hygiene and personal care products, functioning as a modifier, emulsifier, buffer, chelating agent, and stabilizer. For instance, it can prevent crystallization in bar soaps and enhance the texture of hygiene products.

Flammability and Explosibility


Who Evaluation

Evaluation year: 1982


7758-29-4 Relevant articles

Innovative application of sodium tripolyphosphate for the flotation separation of scheelite from calcite

Xu Wang a b d, Wenhao Jia a b, Congren Yang a b, Rui He a, Fen Jiao a b, Wenqing Qin a b, Yanfang Cui a b, Zhengquan Zhang a b, Wei Li a b, Hao Song c d

, Minerals Engineering Volume 170, 15 August 2021, 106981

As suggested from the flotation test results, sodium tripolyphosphate have a good selective depression effect on calcite. The results of adsorption test, Zeta potential measurement, and FTIR spectra indicate that the selective adsorption of sodium tripolyphosphate on calcite surface hindered the further adsorption of FX-6 type sodium oleate (FX-6) on calcite surface, which prevented the flotation of calcite.

Effect of sodium tripolyphosphate on the interaction and aggregation behavior of ovalbumin-lysozyme complex

Haobo Jin, Peishan Li, Yongguo Jin, Long Sheng

, Food Chemistry Volume 352, 1 August 2021, 129457

The mechanism by which sodium tripolyphosphate affected the aggregation behavior of ovalbumin-lysozyme complexes was investigated in this work. The highest stability coefficients were detected for natural ovalbumin and lysozyme at pH 9.0 and pH 5.0, with values of 0.981 and 0.931, respectively.