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

All 8 HTS codes under heading 2508 (other clays), with their duty rates from the 2026 HTS Revision 23. General duty Free.

Every line of heading 2508

  • 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 (under: Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths) (t): General Free; Special none; Column 2 $3.20/t.
  • 2508.30.00.00 Fire-clay (under: Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths) (t): General Free; Special none; Column 2 $1.97/t.
  • 2508.40.01 Other clays (under: Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths): General Free; Special none; Column 2 $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 (under: Other clays) (t).
  • 2508.50.00.00 Andalusite, kyanite and sillimanite (t): General Free; Special none; Column 2 Free.
  • 2508.60.00.00 Mullite (under: Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths) (t): General Free; Special none; Column 2 30%.
  • 2508.70.00.00 Chamotte or dinas earth (under: Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths) (t): General Free; Special none; Column 2 Free.

About these rates

The rates are those printed in the 2026 HTS Revision 23, published by the U.S. International Trade Commission. A 10-digit statistical line takes the rates printed on the 8-digit line above it. Chapter 99 duties (Section 232, Section 301, IEEPA) depend on the product, the origin and the date, are charged on top, and are not included. A code here is a strong lead, not a ruling: confirm it with a customs broker or a CBP binding ruling.

Last reviewed 2026-11-12.