HTS heading 6903
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 — 6 codes under this heading, with the duty on each.
| Code | Description | General rate | Units |
|---|---|---|---|
| 6903 | 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 + Ch. 99 | not stated | — |
| 6903.10.00.00 | Containing by weight more than 50 percent of free carbon + Ch. 99 | Free | kg |
| 6903.20.00.00 | Containing by weight more than 50 percent of alumina (Al2O3) or of a mixture or compound of alumina and of silica (SiO2) + Ch. 99 | Free | kg |
| 6903.90.00 | Other + Ch. 99 | Free | — |
| 6903.90.00.10 | Of clay + Ch. 99 | Free (inherited from 6903.90.00) | kg |
| 6903.90.00.50 | Other + Ch. 99 | Free (inherited from 6903.90.00) | kg |
2 of these lines state no rate of their own and inherit one from the line above, which is how the schedule is read. Each says which line it came from.
Additional duties may apply
6 lines here reference Chapter 99, where Section 301, Section 232 and other additional duties live. Those are charged on top of the general rate and depend on where the goods were made. What those provisions are.
Source: Harmonized Tariff Schedule of the United States, U.S. International Trade Commission (public domain). Classification and the duties that finally apply to a shipment are a licensed customs broker's call.