Other refractory ceramic goods, containing by weight more than 50% of free carbon
Tariff Classification
section 13
Articles of stone, plaster, cement, asbestos, mica or similar materials; ceramic products; glass and glassware
chapter 69
Ceramic products
69.03
Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths, rods and slide gates), other than those of siliceous fossil meals or of similar siliceous earths:
6903.10
-Containing by weight more than 50 % of free carbon