Sodium tripolyphosphate (STPP)
Typical specification
| Item | Standard |
| Appearance | White powder or granular |
| Na5P3O10, % | 94min |
| P2O5, % | 57min |
| Water insoluble matter, % | 0.1max |
| Iron (Fe), % | 0.015max |
| PH value (1% water solution) | 8-10 |
| Whiteness, % | 90min |
| Phase I | 10-30 |
| Bulk Density, g/cm3 | 0.55-0.75 |
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