Sodium Tripolyphosphate (STPP)
Sodium triphosphate (STP), also sodium tripolyphosphate (STPP), or tripolyphosphate (TPP),is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid.
Advisory message
- Details
- parameter
Molecular Formula
Na5P3O10
Appearances and Properties
STPP is a colourless salt, which exists both in anhydrous form and as the hexahydrate.
Uses
The majority of STPP is consumed as a component of commercial detergents. It serves as a "builder," industrial jargon for a water softener. STPP is a preservative for seafood, meats, poultry, and animal feeds. In foods, STPP is used as an emulsifier and to retain moisture.
| ITEM | SPECIFICATIONS |
| Sodium tripolyphosphate | 95% min |
| Phosphorus pentoxide | 57% min |
| Water insolubies | 0.1% max |
| Chloride | 05% max |
| PH value | 9.5-9.9 |
| Iron | 0.01% max |
| Heavy metals as Pb | 0.001% max |
| Arsenic as As | 0.0003% max |
| Density | 0.65—0.75 g/cm3 |
