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STPP or sodium triphosphate is an inorganic compound with formula Na5P3O10. STPP, sodium tripolyphosphate food grade is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid. Sodium tripolyphosphate is produced by heating a stoichiometric mixture of disodium phosphate, Na2HPO4, and monosodium phosphate, NaH2PO4, under carefully controlled conditions. Sodium tripolyphosphate sodium tripolyphosphate stpp powder.
| Product Name | Sodium tripolyphosphate -- STPP |
| HS CODE | 2835310000 |
| CAS No. | 7758-29-4 |
| EINECS No. | 231-838-7 |
| MF | Na5P3O10 |
| Molecular weight | 367.86 |
| Appearance | White Powder |
| Grade | Tech grade \ Food Grade |
| Shelf Life | 2 years |
| Certification | Halal,Kosher,Iso,Haccp |
| Packing | 25kg/bags |
| STPP | Specifications |
| NA5P3O10 | 95% Min |
| P2O5 | 56.0%-58.0% |
| Water Insoluble | 010% Max |
| PH Value | 9.5-10.0 |
| F | 10ppm Max |
| As | 1ppm Max |
| LEAD | 1ppm Max |
| cadmium | 1ppm max |
| hg | 1ppm max |
| al | 200ppm max |
| Heavy metals (As Pb) | 10ppm Max |
| Bulk density | 0.70-0.80 g/ml |
| Whiteness | 85% Min |
| 80 MESH RESIDUE | 25% min |
| 100 MESH RESIDUE | 50% min |
| STPP | Specifications |
| NA5P3O10 | 94% Min |
| P2O5 | 57% MIN |
| Water Insoluble | 010% Max |
| PH Value | 9.2-10.0 |
| density | 0.40-1.0 g/CM3 |
| Whiteness | 85% Min |
The majority of STPP is consumed as a component of commercial detergents. It serves as a "builder," industrial jargon for a water softener. In hard water (water that contains high concentrations of Mg2+ and Ca2+), detergents are deactivated. Being a highly chargedchelating agent, TPP5- binds to dications tightly and prevents them from interfering with the sulfonate detergent.
STPP is a preservative for seafood, meats, poultry, and animal feeds.It is common in food production as E number E451. In foods, STPP is used as an emulsifier and to retain moisture. Many governments regulate the quantities allowed in foods, as it can substantially increase the sale weight of seafood in particular. The UnitedStates Food and Drug Administration lists STPP as "generally recognized as safe".
Other uses (hundreds of thousands of tons/year) include "ceramics, leather tanning(as masking agent and synthetic tanning agent - SYNTAN), anticaking, setting retarders, flame retardants, paper, anticorrosion pigments, textiles, rubber manufacture, fermentation, antifreeze.
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