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 10 REFRACTORY BRICKS, CONT. BY WGT,>50% OF THE ELEMENTS MG, CA, OR CR,...... Commodity Code Description 69 02 10 10 REFRACTORY BRICKS, CONT. BY WGT,>50% OF THE ELEMENTS MG, CA, OR CR,...... 69 02 10 90 OTHER REFRACTORY BLOCKS/TILES & SIM. REFRACTORY CERAMIC CONSTRUCTIONAL....