Section 13 ARTICLES OF STONE, PLASTER,CEMENT,ASBESTOS, MICA OR SIMILAR MATERIALS; CERAMIC PRODUCTS; GLASS AND GLASSWARE 69 CERAMIC PRODUCTS. 69 02 SIMILAR SILICEOUS EARTHS. 69 02 20 REFRACTORY BRICKS, CONT. BY WGT.>50% OF ALUMINA, OF SILICA/OF A MIXTURE... Commodity Code Description 69 02 20 10 REFRACTORY BRICKS, CONT. BY WGT.>50% OF ALUMINA, OF SILICA/OF A MIXTURE... 69 02 20 90 OTHER REFRACTORY BLOCKS/TILES & SIM. REFRACTORY CERAMIC CONSTRUCTIONAL....