Zhengzhou Cavern Industry And Commerce Co., Ltd.
Main products:SLS,SLES,DOP,Lithopone,PVC Resin
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  • Contact Person : Ms. Fon Wendy
  • Company Name : Zhengzhou Cavern Industry And Commerce Co., Ltd.
  • Tel : 0086-371-56608701
  • Fax : 0086-371-55910653
  • Address : Henan,Zhengzhou,A-506 Jinxiuhuating,No.20 Baihua Road,Zhongyuan District,Zhengzhou,China
  • Country/Region : China
  • Zip : 450003

white powder STPP Sodium Tripolyphosphate for soap

white powder STPP Sodium Tripolyphosphate for soap
Product Detailed
Sodium Tripolyphosphate STPP for soap 1. soften hard water 2. salient chelating capacity 3. outstanding emulsification

Sodium Tripolyphosphate (STPP)

Molecular formula: Na5P3O10;Molecular weight: 367.86CAS No.: 7758-29-4;


Synonym: Pentasodium Triphosphate; Pentasodium Tripolyphosphate; Sodium Phosphate Tripoly; Sodium Triphosphate; Sodium Tripolyphosphate; Stpp; Triphosphoric Acid, Pentasodium Salt 



Properties: white powder; melting point 622°C; easily soluble in water;

it has got salient chelating capacity to ions of ca and mg etc.

And can soften hard water to make suspension solution become into clear solution;

it has got weak alkalinity but no corrosiveness.

It is a surfactant, and has got outstanding emulsification to lubricants and fat.

It has different bulk density, i.e. low density 0.35-0.5g/cm3, medium density 0.51-0.65g/cm3 and high density 0.66-0.9g/cm3. This product has two crystalline forms, namely Type I (high temperature type) and Type II (low temperature type). The chemical properties of the two types are the same, and the difference between them lies in the thermostability, hygroscopicity, solubility and hydration heat when dissolving .


Technical Specifications: 

Phase I



Tech grade


 Main content              %≥



 P2O5                          %≥



 Water insoluble         %≤



 Iron, as Fe                 %≤



 PH of 1% water solution



Low density


Medium density


High density

0.66-0.9 g/cm3


Through 16 mesh sieve  95%

Through 35 mesh sieve  90%

Through 100 mesh sieve  40%


Application: 1) as one of the main auxiliaries for synthetic detergent, synergist for soap; water softener. 2)Tanning agent for leather making, auxiliary for dyeing; 3)As an effective dispersion agent for suspensions of coatings, kaolin, magnesium oxide, calcium carbonate and drilling mud etc.; 4) For ceramics manufacture.


Packaging: 25kg PP woven bag or according to customized packing.


white powder STPP Sodium Tripolyphosphate for soap

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