Section 13 ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIAL S; CERAMIC PRODUCTS; GLASS AND GLASSWARE 69 Ceramic products 69 03 Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzle 69 03 10 Containing, by weight, more than 50 % free carbon 69 03 10 00 Containing, by weight, more than 50 % free carbon Commodity Code Description 69 03 10 00 00 Containing, by weight, more than 50 % free carbon 69 03 20 00 00 - Containing by weight more than 50 % of alumina (Al2O3) or of a mixture or compound of 69 03 90 00 00 - Other