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Sodium tripolyphosphate (STMP) is a cyclic polyphosphate with the systematic name trisodium tripolyphosphate. Its molecular formula is 3Na₅P₉O₉, and its molecular weight is 305.88. At room temperature, it appears as a white crystalline powder that is odorless and tasteless. It is highly soluble in water but insoluble in organic solvents such as alcohols, and it possesses excellent chelating properties.
| Item | Specification |
| Melting Point | 627.6℃ |
| Boiling Point | Decomposition temperature > 627.6°C |
| Density | 2.476 g/cm³ (25°C) |
| Flash Point | 81.1°C |
| Vapor Pressure | N/A |
| Refractive Index | 1.478 |
| Solubility | Easily soluble in water (25°C, 21 g/100 mL); insoluble in organic solvents such as ethanol and diethyl ether. |
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