Other clays

Code 2508.40.01 covers various types of clays – including common blue clay, decolorizing earths, and other unspecified clays – as well as andalusite, kyanite, and sillimanite. Use this code for classifying these mineral products, which generally enter the US duty-free as outlined in Chapter 25, when importing in a crude or minimally processed state.

Detailed information for HTS Code 2508.40.01

This code falls within the broader category of mineral products, specifically dealing with clays and earths. Code 2508.40.01 covers other clays, including andalusite, kyanite, sillimanite, mullite, chamotte, or dinas earths, in their unexpanded, washed, crushed, or ground states. Further breakdown exists for common blue clay and ball clays (2508.40.01.10), decolorizing earths and fuller’s earth (2508.40.01.20), and all other clays (2508.40.01.50), so choose the statistical suffix that best matches the specific type of clay being reported. These products should not be expanded or subjected to significant processing beyond washing, crushing, or grinding as outlined in the chapter notes.

Chapter	Chapter 25 - Salt; sulfur; earths and stone; plastering materials, lime and cement
Section	Section V - Mineral Products

Duty snapshot

Quick reference for the duty outcomes tied to this HTS line.

General Duty

Free

Standard trade partners (NTR)

Special Duty

N/A

Eligible FTA or preference programs

The general duty rate for HTS code 2508.40.01 and its subdivisions (2508.40.01.10, 2508.40.01.20, and 2508.40.01.50) is Free, indicating no duty is assessed on these “Other clays” when imported from standard trade partners. Special rates are not specified, but eligibility for preferential trade agreements (FTA) or other preference programs may offer reduced or zero duty rates; however, specific details depend on the country of origin and applicable trade agreement. All reported quantities must be in metric tons (t).

Rate of Duty (Column 2): $1.97/t

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Code subdivisions

2508.40.01.10

Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths: > Other clays > Common blue clay and other ball clays

2508.40.01.20

Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths: > Other clays > Decolorizing earths and fuller's earth

2508.40.01.50

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

View HTS reference

Chapter & section notes

Chapter notes

Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes CHAPTER 25 SALT; SULFUR; EARTHS AND STONE; PLASTERING MATERIALS, LIME AND CEMENT V 25-1 Notes 1. Except where their context or note 4 to this chapter otherwise requires, the headings of this chapter cover only products which are in the crude state or which have been washed (even with chemical substances eliminating the impurities without changing the structure of the product), crushed, ground, powdered, levigated, sifted, screened, concentrated by flotation, magnetic separation or other mechanical or physical processes (except crystallization), but not products which have been roasted, calcined, obtained by mixing or subjected to processing beyond that mentioned in each heading. The products of this chapter may contain an added anti-dusting agent, provided that such addition does not render the product particularly suitable for a specific use rather than for general use. 2. This chapter does not cover: (a) Sublimed sulfur, precipitated sulfur or colloidal sulfur (heading 2802); (b) Earth colors containing 70 percent or more by weight of combined iron evaluated as FeO (heading 282l); 2 3 (c) Medicaments or other products of chapter 30; (d) Perfumery, cosmetic or toilet preparations (chapter 33); (e) Dolomite ramming mix (heading 3816); (f) Setts, curbstones or flagstones (heading 6801); mosaic cubes and the like (heading 6802); roofing, facing or damp course slates (heading 6803); (g) Precious or semiprecious stones (heading 7102 or 7103); (h) Cultured crystals (other than optical elements) weighing not less than 2.5 g each, of sodium chloride or of magnesium oxide, of heading 3824; optical elements of sodium chloride or of magnesium oxide (heading 9001); (ij) Billiard chalks (heading 9504); or (k) Writing or drawing chalks or tailors' chalks (heading 9609). 3. Any products classifiable in heading 2517 and any other heading of the chapter are to be classified in heading 2517. 4. Heading 2530 applies, inter alia, to: vermiculite, perlite and chlorites, unexpanded; earth colors, whether or not calcined or mixed together; natural micaceous iron oxides; meerschaum (whether or not in polished pieces); amber; agglomerated meerschaum and agglomerated amber, in plates, rods, sticks or similar forms, not worked after molding; jet; strontianite (whether or not calcined), other than strontium oxide; broken pieces of pottery, brick or concrete. Statistical Note 1. For the purposes of heading 2525: (a) The term "split block mica" means mica, not exceeding 0.508 mm in thickness, that has been split and selected within a tolerance of 0.203 mm, but which has not been cut or stamped to dimensions, shape or form; (b) The term "mica splittings" means mica laminae in book-form or book-pack, or in loose pack, suitable for use in the manufacture of agglomerated (built-up) mica included in heading 6815. Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes V 25-2

Section notes

SECTION V MINERAL PRODUCTS V-1 Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes V-2 Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes

Latest update

Last updated

November 15, 2025

Revised every January & July

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