Section 13 ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIAL S; CERAMIC PRODUCTS; GLASS AND GLASSWARE 69 Ceramic products 69 02 Refractory bricks, blocks, tiles and similar refractory ceramic constructional g 69 02 10 69 02 10 00 Commodity Code Description 69 02 10 00 00 - Containing by weight, singly or together, more than 50 % of the elements Mg, Ca or Cr, 69 02 20 00 00 - Containing by weight more than 50 % of alumina (Al2O3), of silica (SiO2) or of a mixtu 69 02 90 00 00 - Other