| 2508 | | Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths: | | | | |
| 2508.10.00 | 00 | Bentonite | t | Free | | $3.20/t |
| 2508.30.00 | 00 | Fire-clay | t | Free | | $1.97/t |
| 2508.40.01 | | Other clays | | Free | | $1.97/t |
| 2508.40.01 | 10 | Common blue clay and other ball clays | t | | | |
| 2508.40.01 | 20 | Decolorizing earths and fuller's earth | t | | | |
| 2508.40.01 | 50 | Other | t | | | |
| 2508.50.00 | 00 | Andalusite, kyanite and sillimanite | t | Free | | Free |
| 2508.60.00 | 00 | Mullite | t | Free | | 30% |
| 2508.70.00 | 00 | Chamotte or dinas earth | t | Free | | Free |
