| 3815.19 | 210 | - Silica-alumina catalysts |
| 3815.90 | 200 | 2 Silica-alumina catalysts |
| 6902.20 | 000 | Containing by weight more than 50 % of alumina (Al2O3), of silica (SiO2) or of a mixture or compound of these products |
| 6903.20 | 000 | Containing by weight more than 50 % of alumina (Al2O3) or of a mixture or compound of alumina and of silica (SiO2) |
