2508.40.01.50
Other
Classification path
- Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths
- Other clays
- Other
Rates of duty
- General (MFN)
- Free
- Column 2Cuba, North Korea, Russia, Belarus
- $1.97/t
- Unit of quantity
- t
Related lines in heading 2508
About heading 2508
Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths
Heading 2508 covers other clays not including expanded clays of heading 6806, plus andalusite, kyanite, sillimanite, mullite, and chamotte or dinas earths. It is split first by material: bentonite, fire-clay, other clays, andalusite/kyanite/sillimanite, mullite, and chamotte or dinas earths. All listed lines have a general (MFN) rate of Free.
Full guide to heading 2508Products in this heading
- Raw bentonite clay
- Fire-clay
- Ball clay
- Fuller's earth
- Andalusite
- Kyanite
- Mullite
- Chamotte
Frequently asked questions
What is the HTS code for bentonite?
Bentonite is classified under 2508.10.00.00. Its general (MFN) rate is Free.
What is the duty on fire-clay?
Fire-clay is classified under 2508.30.00.00. The general (MFN) rate is Free.
How do I classify mullite?
Mullite is classified under 2508.60.00.00. The general (MFN) rate for that line is Free.
Source: USITC Harmonized Tariff Schedule, retrieved October 22, 2026.