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| Sodium Tripolyphosphate (STPP) | |
| Appearance | White powder, free from impurities |
| Na5P3O10 content | 94.0% Min |
| P205 content | 57.0% Min |
| Phase I content | 10-20% |
| Moisture | 0.1% Max |
| Fe | 50 ppm Max |
| Insoluble in water | 0.1% Max |
| Whiteness | 92% |


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