Section 13 ARTICLES OF STONE, PLASTER,CEMENT,ASBESTOS, MICA OR SIMILAR MATERIALS; CERAMIC PRODUCTS; GLASS AND GLASSWARE 69 CERAMIC PRODUCTS. 69 03 THAN THOSE OF SILICEOUS FOSSIL MEALS OR OF SIMILAR SILICEOUS EARTHS. 69 03 20 OTH. REFRACTORY CERAMIC GOODS, CONT.BY WGT>50% OF ALUMINA/A MIXTURE/...... Commodity Code Description 69 03 20 00 OTH. REFRACTORY CERAMIC GOODS, CONT.BY WGT>50% OF ALUMINA/A MIXTURE/......