Description of STPP
STPP is an inorganic compound with formula Na5P3O10. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid.
It used in 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.
Main Characteristic of STPP:
1. White powder; Melting point 622 °C
2. It has got salient chelating capacity to metal ions of Ca and Mg etc. and can soften hard water to make suspension into solution, alkalinity, without causticity .
3. It is a surfactant, and has got outstanding emulsification to lubricants and fat.
4. It has different bulk density, i.e. low density 0.35-0.6g/cm 3 , medium density 0.6-0.8g/cm3 and high density 0.8-1.0g/cm 3
Specification of STPP:
NO. |
Indexes |
Industrial Grade |
Food Grade |
1 |
Assay Na5P3O10 % ≥ |
94.0 |
94.0 |
2 |
P2 O 5 % ≥ |
57.0 |
57.0 |
3 |
Water Insoluble Matter % ≤ |
0.15 |
0.05 |
4 |
Iron(Fe) % ≤ |
0.015 |
0.015 |
5 |
PH value (1% water solution) |
9.2-10.0 |
9.5-10.0 |
6 |
Heavy Metal (as Pb) % ≤ |
|
0.001 |
7 |
Arsenic (As) % ≤ |
|
0.0003 |
8 |
Fluoride (F) % ≤ |
|
0.003 |
9 |
Whiteness % ≥ |
90 |
90 |
10 |
Ignition loss |
1.0 |
1.0 |
11 |
density (g/cm3) |
0.35-1.0 |
0.35-1.0 |
12 |
Phase I |
5-40 |
5-40 |
13 |
Testing Standard |
QB1034-91 |
GB25566-2010 |
Applications of STPP:
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.
Package & Storage of STPP:
25 KG bag , 25MT/20'FCL .
also be packed according to customer's needs.
Store closed containers in a cool, dry, well-ventilated area. Avoid exposure to direct sunlight.
Quality Certificate
ISO9001:2008 -Quality Management System; SGS certification; FDA certification