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HTS 2508Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths

Product or HTS code

Rate lines8

Code	Description	General	Special	Column 2	Units	Calculate
2508.10.00.00	2508.10.00.00BentoniteGeneral Free · Column 2 $3.20/t · t	Free		$3.20/t	t
2508.30.00.00	2508.30.00.00Fire-clayGeneral Free · Column 2 $1.97/t · t	Free		$1.97/t	t
2508.40.01	2508.40.01Other claysGeneral Free · Column 2 $1.97/t	Free		$1.97/t
2508.40.01.10	2508.40.01.10Common blue clay and other ball claysGeneral Free · Column 2 $1.97/t · t	Free		$1.97/t	t
2508.40.01.20	2508.40.01.20Decolorizing earths and fuller's earthGeneral Free · Column 2 $1.97/t · t	Free		$1.97/t	t
2508.40.01.50	2508.40.01.50OtherGeneral Free · Column 2 $1.97/t · t	Free		$1.97/t	t
2508.50.00.00	2508.50.00.00Andalusite, kyanite and sillimaniteGeneral Free · Column 2 Free · t	Free		Free	t
2508.60.00.00	2508.60.00.00MulliteGeneral Free · Column 2 30% · t	Free		30%	t
2508.70.00.00	2508.70.00.00Chamotte or dinas earthGeneral Free · Column 2 Free · t	Free		Free	t

2026 HTS Revision 21 (October 9, 2026)

Duty by country of origin

Rate line	Canada28.55% of imports	Spain12.89% of imports	China12.21% of imports	Mexico12.12% of imports	Germany6.61% of imports	France4.64% of imports	South Africa4.17% of imports	United Kingdom2.39% of imports	Hungary1.49% of imports	Czechia1.44% of imports
2508.10.00.00Bentonite	10%9903.05.29	10%9903.05.39	37.5%9903.05.319903.88.03	10%9903.05.55	10%9903.05.39	10%9903.05.39	12.5%9903.05.69	10%9903.05.81	10%9903.05.39	10%9903.05.39
2508.30.00.00Fire-clay	10%9903.05.29	10%9903.05.39	12.5%9903.05.31	10%9903.05.55	10%9903.05.39	10%9903.05.39	12.5%9903.05.69	10%9903.05.81	10%9903.05.39	10%9903.05.39
2508.40.01.10Common blue clay and other ball clays	10%9903.05.29	10%9903.05.39	37.5%9903.05.319903.88.03	10%9903.05.55	10%9903.05.39	10%9903.05.39	12.5%9903.05.69	10%9903.05.81	10%9903.05.39	10%9903.05.39
2508.40.01.20Decolorizing earths and fuller's earth	10%9903.05.29	10%9903.05.39	37.5%9903.05.319903.88.03	10%9903.05.55	10%9903.05.39	10%9903.05.39	12.5%9903.05.69	10%9903.05.81	10%9903.05.39	10%9903.05.39
2508.40.01.50Other	10%9903.05.29	10%9903.05.39	37.5%9903.05.319903.88.03	10%9903.05.55	10%9903.05.39	10%9903.05.39	12.5%9903.05.69	10%9903.05.81	10%9903.05.39	10%9903.05.39
2508.50.00.00Andalusite, kyanite and sillimanite	10%9903.05.29	10%9903.05.39	37.5%9903.05.319903.88.03	10%9903.05.55	10%9903.05.39	10%9903.05.39	12.5%9903.05.69	10%9903.05.81	10%9903.05.39	10%9903.05.39
2508.60.00.00Mullite	10%9903.05.29	10%9903.05.39	37.5%9903.05.319903.88.03	10%9903.05.55	10%9903.05.39	10%9903.05.39	12.5%9903.05.69	10%9903.05.81	10%9903.05.39	10%9903.05.39
2508.70.00.00Chamotte or dinas earth	10%9903.05.29	10%9903.05.39	37.5%9903.05.319903.88.03	10%9903.05.55	10%9903.05.39	10%9903.05.39	12.5%9903.05.69	10%9903.05.81	10%9903.05.39	10%9903.05.39

Total duty on a $10,000 ocean shipment entered 2026-10-13, before customs fees. Origins are the leading sources of US imports under this heading in 2025 (US Census Bureau).