HS Code 2521
Limestone Flux and Calcareous Stone
HS code 2521 is for limestone flux and calcareous stone used for the manufacture of lime or cement, excluding building stone of 2515.
4-digit Section VBulk
HS Code 2521 — Limestone Flux and Calcareous Stone
This code covers limestone flux and other calcareous stones used in the industrial manufacture of lime or cement. It is a high-volume industrial mineral used extensively in steel refining and building material production.
What's included
- Limestone flux
- Cement-grade limestone
- Calcareous stone powder for lime
- Raw limestone for smelting
What's excluded
- Building limestone → use
2515(If used as monumental or building stone, it falls under 2515.) - Quicklime → use
2522(If the stone has been burned/calcined into lime, use 2522.)
Common examples
- Limestone flux for steel blast furnaces
- Raw limestone for cement plants
- Crushed calcareous stone for lime kilns
- Limestone chips for industrial processing
Frequently asked questions
Can I use 2521 for decorative limestone?
No, decorative or monumental limestone is classified under 2515. 2521 is strictly for industrial flux or cement use.
Trade & shipping notes
- Typical duty range: 0% - 5%
- Documentation: Calcium carbonate content should be clearly stated on the technical spec sheet.
- Typical shipping mode: Bulk
- Top exporters: United Arab Emirates, Vietnam, Oman, Japan
- Top importers: India, South Korea, China, Taiwan
Related HS codes
Key takeaway
Strictly limited to limestone types intended for use as industrial flux or in the production of lime and cement.
Related HS codes
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