| Items | Kwaliteit | |||||
| Sc2O3 /REO% min. | 99.9 | 99.95 | 99.99 | 99.999 | 99.9995 | |
| Zeldzame aardonzuiverheden % max. | (La+CE+Pr+ ND+SM+EU+ GD+TB+Dy+ Ho+er+TM+ YB+Lu+Y)Roy /REO | Totaal 0.15 | Totaal 0.05 | Totaal 0.01 | Totaal 0.001 | Totaal 0.0005 |
| Niet-zeldzame aardonzuiverheden % max. | SiO2 | 0.02 | 0.01 | 0.002 | 0.0015 | 0.001 |
| Fe2O3 | 0.02 | 0.005 | 0.001 | 0.0005 | 0.0005 | |
| CAO | 0.03 | 0.015 | 0.003 | 0.0015 | 0.001 | |
| ZrO2 | 0.1 | 0.03 | 0.003 | 0.0015 | 0.0005 | |
| Al2O3 | 0.05 | 0.003 | 0.001 | 0.0005 | 0.0005 | |
| TiO2 | 0.05 | 0.01 | 0.005 | 0.003 | 0.001 | |
| CUO | - | 0.02 | 0.005 | 0.002 | 0.0005 | |
| V2O3 | - | 0.002 | 0.0005 | 0.0005 | 0.0005 | |
| MgO | - | - | 0.0005 | 0.0005 | 0.0005 | |
| NAO | - | - | 0.001 | 0.0005 | 0.0005 | |
| NIO | - | - | 0.0005 | 0.0005 | 0.0005 | |
| L.O.I en water % Max. | 1 | 1 | 1 | 1 | 1 | |