Limestone flux; limestone and other calcareous stone, of a kind used for the manufacture of lime or cement
1 declarable lines
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.
Products 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
How to choose the right subheading
- Confirm the material is limestone or other calcareous stone, not chalk, dolomite, gypsum, or a finished lime or cement product.
- Confirm the stone is of a kind used to manufacture lime or cement; building or monumental stone points to heading 2515.
- Confirm the goods are raw or uncalcined; burned or slaked lime moves to heading 2522, and cement or clinker to heading 2523.
- Because heading 2521 has one declarable line, classify qualifying goods under 2521.00.00.00 at the general (MFN) rate of Free.
Often confused with
- Heading 2509Chalk
Chalk has its own heading even when it is a calcareous material.
- Heading 2522Quicklime, slaked lime and hydraulic lime
Calcined lime products are classified in heading 2522, not as raw limestone.
- Heading 2523Portland cement and cement clinkers
Finished hydraulic cements and clinkers are classified in heading 2523.
- Heading 2515Marble and travertine building stone
Monumental or building calcareous stone is in heading 2515 when not for lime or cement manufacture.
- Heading 2518Dolomite
Dolomite has its own heading, whether or not calcined or sintered.
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.
Guide written from the official schedule text. Rates quoted are general (MFN) rates; check the line page for trade agreement rates and the classification of your exact product.