Harmonized System
Section XIII
ARTICLES OF STONE, PLASTER, CEMENT, ASBESTOS, MICA OR SIMILAR MATERIALS; CERAMIC PRODUCTS; GLASS AND GLASSWARE
Chapter 69
Ceramic products
Heading 6903
Other refractory ceramic goods (for example, retorts, crucibles, muffles, nozzles, plugs, supports, cupels, tubes, pipes, sheaths and rods), other than those of siliceous fossil meals or of similar siliceous earths.
6903.10
- Containing by weight more than 50Â % of graphite or other carbon or of a mixture of these products
6903.20
- Containing by weight more than 50Â % of alumina (Al2O3) or of a mixture or compound of alumina and of silica (SiO2)
6903.90