Heading 2508: Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths
In chapter 25, Salt; sulfur; earths and stone; plastering materials, lime and cement. 6 rate lines, laid out as HTS Revision 20 (2026) prints them.
| HTS number | Description | Units | General | Special | Column 2 |
|---|---|---|---|---|---|
| 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 |
Rates are quoted as printed. Each 8-digit number opens its own page with footnotes and cited chapter 99 headings.
Watch lines in heading 2508
Pick the 8 or 10 digit numbers you import and we email you the old and new text whenever a new HTS revision changes them.
See the alert plansNo line in this heading cites a chapter 99 heading in its footnotes or rate columns.
What this page leaves to your broker
This page quotes the schedule. It does not add the rates together, and it does not say whether a chapter 99 heading applies to a shipment: that turns on the country of origin, the dates and the U.S. notes to chapter 99. Section 301, Section 232 and other chapter 99 measures list the goods they cover in those notes and in Federal Register notices, so a line can be covered by a heading its footnotes never cite. A licensed customs broker makes the determination.
Built September 29, 2026 from HTS Revision 20 (2026) (USITC release 2026HTSRev20, published September 23, 2026, current since September 28, 2026). The schedule changes often; USITC's own site always has the current text.