| 6902.10.00 | - Containing by weight, singly or together, more than 50% of the elements Mg, Ca or Cr, or expressed as MgO, CaO or Cr2O3 | |
| 6902.20.00 | - Containing by weight more than 50% of alumina (Al2O3), of silica (SiO2) or of a mixture or compound of these products | |
| 6902.90.00 | - Other |