HS Heading 2508 : Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths
HS Heading 2508 encompasses other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths. It classifies 6 6-digit WCO subheadings within Chapter 25 under the Harmonized System [USITC HTS 2026].
Subheadings Under Heading 2508
| HS Code | WCO 6-Digit Subheading Description | Chapter | Operational Package |
|---|---|---|---|
| 2508.10 | Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths, Bentonite | 25 | View 2508.10 Package → |
| 2508.30 | Other clays (not including expanded clays of heading 6806), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths, Fire-clay | 25 | View 2508.30 Package → |
| 2508.40 | Other clays | 25 | View 2508.40 Package → |
| 2508.50 | Andalusite, kyanite and sillimanite | 25 | View 2508.50 Package → |
| 2508.60 | Mullite | 25 | View 2508.60 Package → |
| 2508.70 | Chamotte or dinas earth | 25 | View 2508.70 Package → |
How to Select the Correct Subheading Under Heading 2508
Commercial shipments must be declared under the exact 6-digit WCO subheading that matches physical, chemical, or processing characteristics. Review the subheading descriptions above and verify against binding CBP CROSS rulings prior to entry filing.
Official Primary Sources & Authority References
USITC HTS Heading 2508 ↗
United States International Trade Commission official Harmonized Tariff Schedule.
CBP CROSS Rulings ↗
CBP e-Rulings database for Heading 2508 precedent rulings.
WCO Nomenclature ↗
World Customs Organization Harmonized System 2022 nomenclature standard.
U.S. Census Foreign Trade ↗
U.S. Census Bureau HTS-to-NAICS concordance and Schedule B export database.