HTS heading
2508Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths:
Rates as published in 2026 HTS Revision 15, captured 2026-08-13. Source: USITC Harmonized Tariff Schedule.
Current duty rates (6 lines)
| Code | Description | General | Special | Column 2 |
|---|---|---|---|---|
| 2508.10.00.00 | Bentonite | Free | — | $3.20/t |
| 2508.30.00.00 | Fire-clay | Free | — | $1.97/t |
| 2508.40.01 | Other clays | Free | — | $1.97/t |
| 2508.50.00.00 | Andalusite, kyanite and sillimanite | Free | — | Free |
| 2508.60.00.00 | Mullite | Free | — | 30% |
| 2508.70.00.00 | Chamotte or dinas earth | Free | — | Free |
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