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| Classification | Phosphate |
| Name | Sodium Tripolyphosphate |
| CAS No. | 7758-29-4 |
| Other Names | pentasodium tripolyphosphate |
| MF | Na5P3O10 |
| EINECS No. | 231-838-7 |
| Place of Origin | China(Mainland) |
| Grade Standard | Industrial / Technical |
| Brand Name | ZEXIN |
| Appearance | White Powder/Granule |
| Purity | ≥94% |
| Water insoluble | ≤0.1% |
| pH ( 1% solution ) | 9.2~10.0 |
| Phosphoric anhydride | ≥57% |
| Stacking density | 0.35~0.95g/cm3 |
| Whiteness | ≥90% |
Sodium triphosphate (STP), also sodium tripolyphosphate (STPP), or tripolyphosphate (TPP), is an inorganic compound with formula Na5P3O10. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base oftriphosphoric acid. It is produced on a large scale as a component of many domestic and industrial products, especially detergents.