| 2505.10 | 000 | Silica sands and quartz sands |
| 28.26 | | Fluorides; fluorosilicates, fluoroaluminates and other complex fluorine salts |
| 2826.90 | 100 | 1 Fluorosilicates of sodium or of potassium |
| 28.39 | | Silicates; commercial alkali metal silicates |
| 2839.11 | 000 | Sodium metasilicates |
| 28.42 | | Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides |
| 2842.10 | 000 | Double or complex silicates, including aluminosilicates whether or not chemically defined |
| 3815.19 | 210 | - Silica-alumina catalysts |
| 3815.90 | 200 | 2 Silica-alumina catalysts |
| 4005.1 | 0 | Compounded with carbon black or silica |
| 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) |
| 7002.31 | 000 | Of fused quartz or other fused silica |
| 7017.10 | 000 | Of fused quartz or other fused silica |
