Spécification (% )
| Index | LUN | LUN | LUN |
| Lu/TREM+N(%,min) | 99.9 | 99.99 | 99.99 |
| TREM+N(%,min) | 99.0 | 99.5 | 99.9 |
| Apparence | Poudre noire | Poudre noire | Poudre noire |
| IMPURETÉS RE/TEM | %(Max) | %(Max) | %(Max) |
| Lu | Principal | Principal | Principal |
| Ce | \ | \ | \ |
| PR | \ | \ | \ |
| ND | \ | \ | \ |
| SM | \ | \ | \ |
| UE | 0.001 | 0.001 | 0.001 |
| GD | 0.001 | 0.001 | 0.001 |
| TB | 0.001 | 0.001 | 0.001 |
| Bon | 0.001 | 0.001 | 0.001 |
| Hai | 0.001 | 0.001 | 0.001 |
| Er | 0.001 | 0.005 | 0.005 |
| TM | 0.01 | 0.005 | 0.005 |
| YB | 0.01 | 0.005 | 0.005 |
| La | \ | \ | \ |
| OUI | 0.03 | 0.003 | 0.003 |
| Impuretés non réimpuretés | %(Max) | %(Max) | %(Max) |
| FE | 0.15 | 0.1 | 0.01 |
| Si | 0.01 | 0.01 | 0.005 |
| Env | 0.05 | 0.05 | 0.005 |
| Al | 0.01 | 0.01 | 0.005 |
| Mg | 0.01 | 0.01 | 0.005 |
| W | 0.05 | 0.05 | 0.05 |
| Ta | 0.01 | 0.01 | 0.0005 |
| O | 0.15 | 0.15 | 0.015 |