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Sodium tripolyphosphate (STPP) is a white, granular or crystalline powder with the chemical formula Na5P3O10. It is an inorganic compound with a wide range of applications in various industries. STPP is known for its excellent water softening properties, detergent boosting capabilities, and its role as a sequestrant and emulsifier.
| Property | Specification |
|---|---|
| Chemical Formula | Na5P3O10 |
| CAS Number | 7758-29-4 |
| Molecular Weight | 367.86 g/mol |
| Appearance | White granular powder |
| Assay (Na5P3O10 content) | 94.0% min |
| Phosphorus Pentoxide (P2O5) | 56.0% min |
| Water Insoluble Matter | 0.1% max |
| Iron (Fe) | 0.01% max |
| pH (1% solution) | 9.2 – 10.0 |
| Bulk Density (g/cm3) | 0.75 – 0.95 |
| Whiteness | 90.0% min |
| Solubility (20°C) | Soluble |
| Moisture | 0.5% max |