2521.00.00.00
Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
Classification path
- Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
Rates of duty
- General (MFN)
- Free
- Column 2Cuba, North Korea, Russia, Belarus
- Free
- Unit of quantity
- t
About heading 2521
Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
Heading 2521 covers limestone flux and limestone or other calcareous stone of a kind used to manufacture lime or cement. It has one declarable line, 2521.00.00.00, with a general (MFN) rate of Free.
Full guide to heading 2521Products in this heading
- Limestone flux
- Cement-grade limestone
- Limestone for lime kilns
- Crushed calcareous stone for cement manufacture
- Cement rock (argillaceous limestone)
- Calcareous stone feed for lime production
Frequently asked questions
What is the HTS code for limestone flux?
Limestone flux is classified under 2521.00.00.00, with a general (MFN) rate of Free.
What is the duty on limestone used to make cement?
Cement-grade limestone of heading 2521 enters under 2521.00.00.00 at a general (MFN) rate of Free.
How do I classify limestone for lime or cement manufacture?
Classify it in 2521.00.00.00, general (MFN) Free, if it is limestone or other calcareous stone of a kind used to make lime or cement and is not a calcined lime or cement product.
Source: USITC Harmonized Tariff Schedule, retrieved October 21, 2026.