Key facts
- HS code
- 2508.40
- Covers
- Other clays
- Edition
- HS2022
- Duty in the United States
- See its 3 lines
Summary
HS code 2508.40 covers other clays. It sits in heading 25.08 (other clays (not including expanded clays of heading 68.06), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths) in chapter 25 (salt; sulphur; earths and stone; plastering materials, lime and cement). Other goods of heading 25.08 are classified under 2508.10 (bentonite), 2508.30 (fire-clay), 2508.50 (andalusite, kyanite and sillimanite), 2508.60 (mullite) or 1 other. National tariff lines under 2508.40 are live on border.bot for the United States (3 lines, also used by 1 other country).
What this code covers
HS code 2508.40 covers other clays.
The legal text of the subheading is “Other clays”, in HS2022.
What it doesn’t cover
Other goods of heading 25.08 are classified under 2508.10 (bentonite), 2508.30 (fire-clay), 2508.50 (andalusite, kyanite and sillimanite), 2508.60 (mullite) or 1 other.
How it is structured
2508.40 is a six-digit subheading. Its first two digits, 25, are the chapter; the first four, 2508, are heading 25.08; the last two, 40, identify the subheading within the heading.
Countries add their own digits after these six for their national tariff lines.
In other countries
National tariff lines under 2508.40 are live on border.bot for the United States (3 lines, also used by 1 other country).
- United States3 lines, used by 1 other country
Frequently asked questions
What does HS code 2508.40 cover?
HS code 2508.40 covers other clays.
Which heading and chapter is HS code 2508.40 in?
HS code 2508.40 is in heading 25.08 (other clays (not including expanded clays of heading 68.06), andalusite, kyanite and sillimanite, whether or not calcined; mullite; chamotte or dinas earths) in chapter 25 (salt; sulphur; earths and stone; plastering materials, lime and cement).
Where are goods of heading 25.08 classified when 2508.40 doesn’t fit?
Other goods of heading 25.08 are classified under 2508.10 (bentonite), 2508.30 (fire-clay), 2508.50 (andalusite, kyanite and sillimanite), 2508.60 (mullite) or 1 other.
Which countries’ tariffs list national lines under HS code 2508.40?
National tariff lines under 2508.40 are live on border.bot for the United States (3 lines, also used by 1 other country).
Sources and updates
The Harmonized System legal text comes from border.bot release 2 (edition HS 2022), imported from a file, and has been live since 11 October 2026.
This page was last updated on 11 October 2026.
Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.