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Sodium Tripolyphosphate Food Additive STPP

发布时间:2020-06-02 10:53

Sodium Tripolyphosphate Food Additive STPP

Molecular formula: Na5P3O10

Molecular weight: 367.86

CAS No.: 7758-29-4

EINECS No.: 231-838-7

H.S CODE: 28353110


White powder, melting point 622 ℃, soluble in water, has significant chelating ability to calcium and magnesium and other metal ions, can soften hard water, make suspension into solution, weak alkaline, non corrosive, is an inorganic surfactant, has strong emulsifying effect on lubricating oil and fat, bulk density is generally divided into low density 0.35-0.5g/cm3, medium density 0.51-0.65g/cm3, high density 0.66-0.9g/cm3; Pentasodium has two crystalline forms: type I (high temperature type) and type II (low temperature type). Their chemical properties are the same. The difference is that the thermal stability and hygroscopicity of type I are higher than that of type II. At the same time, their solubility and hydration heat during dissolution are different. It is hydrolyzed gradually in water to form orthophosphate, which has good ability to complex metal ions. It can complexate with calcium, magnesium, iron and other metal ions, and has certain properties of organic surfactant.


In the food industry, it is used for the quality improver of canned ham, juice beverage, dairy products, soybean milk, etc. it is mainly used for the tenderization of canned ham and the softening of soybean skin in canned broad bean. It can also be used as softener and thickener.

Packaging and storage

25Kg, 50Kg,1000kg in braided bag lined with plastic. Store it in ventilated, dry and clean place. Moisture proof.

IndexFood grade
Phosphorus pentoxide %≥57.0
Water-insoluble %≤0.05
Iron(Fe) %≤0.01
PH value(1% water solution)9.5-10.0
Heavy metal (Pb) %≤0.001
Arsenic (As) %≤0.0003
Fluoride (F) %≤0.003





White content %≥90.0