
| Specifications | Superior Quality | First-grade | Qualified Products |
| Sodium Tripolyphosphate(Na5P3O10)% ≥ | 96 | 90 | 85 |
| Phosphorus Pentoxide(P2O5)% ≥ | 57.0 | 56.5 | 55.0 |
| Water Insoluble Matter %≤ | 0.10 | 0.10 | 0.15 |
| Fe%≤ | 0.007 | 0.015 | 0.030 |
| PH | 9.2--10.0 | ||
| Whiteness %≥ | 90 | 80 | 70 |
| Granularity(tailover Through 1.00mm Test Sieve)%≤ | 5.0 |