Sodium Tripolyphosphate STPP

Short Description:

  • Product Name: Sodium Tripolyphospha (STPP)te
  • CAS No: 7758-29-4
  • Type: Phosphates
  • Product Detail


    Product Tags

    Product Name:           Sodium Tripolyphosphate(STPP)
    Type:                          Phosphates
    Food Additive:            E451(i)
    Appearance:               White powder
    CAS No:                      7758-29-4
    Molecular Formula:     Na5O10P3
    Molecular Weight:       367.86
    Melting Point:              622 °C
    Density:                       2.52 g/cm3 (20℃)


    Product Description

    Sodium Tripolyphosphate(STPP) has two crystalline forms, namely phase I (high temperature phase) and phase II (low temperature phase). The chemical properties of the two phases are the same, and the difference between them lies in the thermostability, hygroscopicity, solubility and hydration heat when dissolving.



    (1) Used as one of the main auxiliaries for synthetic detergent, synergist for soap; water softener, tanning agent for leather making, auxiliary for dyeing;

    (2) As an effective dispersion agent for suspensions of coatings, kaolin, magnesium oxide, calcium carbonate and drilling mud etc.;

    (3) As an oil contamination resistance agent in paper production.

    (4) In foodstuff industry Sodium Tripolyphosphate(STPP) is used as quality improver in the process of canned food, fruit juice drinks, foodstuffs from milk or soybeans. It may tender the meat in canned ham and soften the skin of horse bean in canned horse bean. It may also serves as a softener or densifier in foodstuff industry.






    Stored in cool,dry,and ventilated storage,free from heat or sunlight,and free from toxic and harmful foods.Be protected with pall on delivery,keep free from rain moisture,toxic and harmful goods.


    Certificate of Analysis

    Test Item Standard Result
    Content (Na5P3O10),  %≥ 94 94.6
    Phosphorus pentoxide,  %≥ 57 57.2
    Water-insoluble, %≤ 0.15 0.1
    PH value(1% water solution) 9.2-10.0 9.9
    White content, %≥ 90 90
    Density/g/cm3 0.5-0.8 0.65
    Content (Na5P3O10),  %≥ 94 94.6
    Phosphorus pentoxide,  %≥ 57 57.2


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