... > SECTION XIII - ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIALS; CERAMIC PRODUCTS; GLASS AND GLASSWARE > CHAPTER 69 - CERAMIC PRODUCTS > I. GOODS OF SILICEOUS FOSSIL MEALS OR OF SIMILAR SILICEOUS EARTHS, AND REFRACTORY GOODS > 6902 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 (Al2O3), of silica (SiO2) or of a mixture or compound of these products > Containing, by weight, 93 % or more of silica (SiO2)