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| Grade | Nb2O5 | |
| Main content, % By substraction(exclusive of F, Ignition Loss) | 99.5 | |
| Impurity content(ppm max.) | Al | 0.002 |
| Cr | 0.003 | |
| Cu | 0.005 | |
| F | 0.1 | |
| Fe | 0.02 | |
| Mn | 0.005 | |
| Mo | 0.003 | |
| Ni | 0.02 | |
| Si | 0.005 | |
| Ta | 0.05 | |
| Ti | 0.002 | |
| W | 0.003 | |
| Ignition Loss, %, max | 0.2 | |
the power of Nb oxide for wide industries