6902201000
- Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than those of siliceous fossil meals or similar siliceous earths
- Containing, by weight, more than 50 % of alumina (Al@2O@3), of silica (SiO@2) or of a mixture or compound of these products
- Containing, by weight, 93 % or more of silica (SiO@2)