HTS heading 2521
Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement — 1 code under this heading, with the duty on each.
| Code | Description | General rate | Units |
|---|---|---|---|
| 2521.00.00.00 | Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement + Ch. 99 | Free | t |
Additional duties may apply
1 line here reference Chapter 99, where Section 301, Section 232 and other additional duties live. Those are charged on top of the general rate and depend on where the goods were made. What those provisions are.
Source: Harmonized Tariff Schedule of the United States, U.S. International Trade Commission (public domain). Classification and the duties that finally apply to a shipment are a licensed customs broker's call.