Section V · Salt; sulphur; earths and stone; plastering materials, lime and cement
2521.00
Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
Chapter
Salt; sulphur; earths and stone; plastering materials, lime and cement
Heading
The product family within the chapter
Subheading
The specific good, identical worldwide
The first six digits are the same in every country that uses the Harmonized System. The United States adds two more for the tariff rate and, often, two more for statistics — which is why the rates below are listed against 8- and 10-digit numbers rather than against this code.
How the schedule reaches this code
- 25Salt; sulphur; earths and stone; plastering materials, lime and cement
- 2521Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
Published US duty rates
Duty is set at the 8- or 10-digit line, not at this 6-digit subheading, so more than one rate can sit under this code.
- 2521.00.00.00Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cementt
- General
- Free
- Special (FTA)
- —
- Column 2
- Free
No preferential rate published.
Countries without normal trade relations.
Schedule footnotes
- See 9903.88.03.
A reference to Chapter 99 means an additional action — a Section 232 or 301 measure, an exclusion, or a quota — applies on top of the rate above.
This is the listed rate. Antidumping and countervailing duty orders, Chapter 99 actions and preference qualification all change what is actually collected, and classification is a judgement about your goods. Verify with your licensed customs broker before you file.
Source: U.S. International Trade Commission (USITC) — 2026 HTS Revision 12, released 2026-07-21, published at hts.usitc.gov. A U.S. Government work in the public domain.