Sodium tripolyphosphate (STPP) food additive e451i

Short Description:

Product Name:Sodium Tripolyphosphate

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℃)

Function: Humectants

Product Detail


Product Tags

1. Product Description

This product 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.

2. 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

3. Application

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 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.

4. Package


5. Storage

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.

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