HTS heading 2508
Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths — 10 codes under this heading, with the duty on each.
| Code | Description | General rate | Units |
|---|---|---|---|
| 2508 | Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths + Ch. 99 | not stated | — |
| 2508.10.00.00 | Bentonite + Ch. 99 | Free | t |
| 2508.30.00.00 | Fire-clay + Ch. 99 | Free | t |
| 2508.40.01 | Other clays + Ch. 99 | Free | — |
| 2508.40.01.10 | Common blue clay and other ball clays + Ch. 99 | Free (inherited from 2508.40.01) | t |
| 2508.40.01.20 | Decolorizing earths and fuller's earth + Ch. 99 | Free (inherited from 2508.40.01) | t |
| 2508.40.01.50 | Other + Ch. 99 | Free (inherited from 2508.40.01) | t |
| 2508.50.00.00 | Andalusite, kyanite and sillimanite + Ch. 99 | Free | t |
| 2508.60.00.00 | Mullite + Ch. 99 | Free | t |
| 2508.70.00.00 | Chamotte or dinas earth + Ch. 99 | Free | t |
3 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
10 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.