2508.50
Andalusite, kyanite and sillimanite
Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths
Where this code sits
- Section V · Chapter25 — SALT; SULFUR; EARTHS AND STONE; PLASTERING MATERIALS, LIME AND CEMENTMINERAL PRODUCTS
- Heading2508 — Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths
- Subheading2508.50 — Andalusite, kyanite and sillimanite
Six digits is as far as the international nomenclature goes, and it is the same six digits in every country that applies the Harmonized System. Your destination adds further digits of its own, and the rate lives on that national line — which is why the US lines below run to eight and ten digits, and why the lookups go to each authority's own tariff.
Duty rate
USITC Harmonized Tariff Schedule of the United States, Revision 18 (2026) · retrieved 13/09/2026
Measures in force on top of this rate
- Antidumping/countervailing duties not checked — they are administered separately, keyed to the exporter, and can exceed the tariff rate. Check for an order in force before relying on this total.
Paste 2508.50 into the lookup and follow it down to your national line.
US national lines under 2508.50
The United States subdivides this subheading into 1 line. They share a duty rate, so the classification below the subheading affects reporting rather than the amount.
| Line | Description | General | Preferential |
|---|---|---|---|
| 2508.50.00.00 | Andalusite, kyanite and sillimanite | Free | — |
A blank General cell means the line states no rate of its own and takes the one above it — the line it is stated on is named, so the figure can be checked where it actually appears. Preferential rates are listed with the programme codes that grant them; the schedule offering a rate is not the same as your goods qualifying for it.
Preferential rates for 2508.50
No preference programme applies to these lines for any origin — the general rate is the rate, wherever the goods come from. That is worth knowing: there is nothing to claim here, so no certificate of origin will reduce the duty.
What chapter 25 excludes
A subheading's wording does not decide a classification — the legal notes do. These are the notes that push goods out of this chapter even when the description seems to fit.
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 Fe2O3 (heading 282l);
- (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).
(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);
Legal notes that govern this code
Reproduced from the published tariff schedule. Section and chapter notes are binding and are part of the nomenclature itself; statistical notes are US reporting rules and are not classification law.
Chapter 25 — Notes
Legal Notes of the Harmonized System. Binding, and part of the international nomenclature.
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 Fe2O3 (heading 282l);
(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.
Chapter 25 — Statistical Notes
US statistical reporting only. NOT classification law.
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.
Notes are reproduced from the published tariff schedule. They govern classification, but reading them is not the same as applying them to your goods — that is what a broker or a binding ruling is for.
Other subheadings under 2508
Elsewhere in chapter 25
Importing 2508.50 into
Each guide covers how duty and tax are assessed there, the authority with jurisdiction, and what catches importers out.
Common questions
What is HS code 2508.50?
2508.50 covers Andalusite, kyanite and sillimanite. It sits under 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.
What is the US duty rate for 2508.50?
The Column 1 General rate is Free, from US national line 2508.50.00.00. That is the rate before any preference you can claim, and it does not include antidumping or countervailing duties, which are administered separately and can exceed it.
What is excluded from chapter 25?
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 Fe2O3 (heading 282l); (c) Medicaments or other products of chapter 30; (d) Perfumery, cosmetic or toilet preparations (chapter 33);