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Sodium tripoly phosphate (STPP)

                                     Sodium tripoly phosphate (STPP)

Byname: Pent-sodium Phosphate

Molecular formula: Na5P3O10                                                    
Molecular Weight: 367.86
Standard executed : GB/T9983-2004(technical grade)
                                  QB1034-91(food grade)

CAS Number: 7758-29-4


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.

Application: As one of the main auxiliaries for synthetic detergent, synergist for soap; water softener, tanning agent for leather making, auxiliary for dyeing; As an effective dispersion agent for suspension solutions of coatings, kaolin, magnesium oxide, calcium carbonate and drilling mud etc.; As an oil contamination resistance agent in paper production. In foodstuff industry it 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.

Guaranteed Technical Specifications :

Specifications

Industrial Grade

Food Grade

AssayNa5P3O10 % ≥

94.0

95.0

P2O5 % ≥

57.0

57.0

Water Insoluble Matter %≤

0.1

0.05

Iron(Fe) %≤

0.01

0.01

PH value(1%water solution)

9.2-10.0

9.5-10.0

Heavy Metal (as Pb) %≤

  /

0.001

Arsenic (As) %≤

 /

0.0003

Fluoride (F) %≤

 /

0.003

Particle Size

Power:
Through 16 mesh sieve %≥
Through 35 mesh sieve %≥
Through 100 mesh sieve %≥

Fine power:

Through 100 mesh sieve %≥

 

95

 90

 40

 90

 

95

 90

40

90

Whiteness %≥

90.0

90.0


Packing and storage:
In 25Kg,50 Kg,1000 Kg bage.store at a cool,dry and well ventileated place.

 

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