Section 13 Articles of stone, plaster, cement, asbestos, mica or similar materials; ceramic products; glass and glassware 69 Ceramic products 69 02 Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than those of siliceous fossil meals or similar siliceous earths. 69 02 20 Containing by weight..., >50% alumina (Al2O3), silica (SiO2) Commodity Code Description 69 02 20 00 Containing by weight..., >50% alumina (Al2O3), silica (SiO2)