Chemical-Grade Flux Limestone
Chemical-grade flux limestone is an ultra-pure calcareous stone with consistent calcium source, used in chemical processes like precipitated calcium carbonate production. It qualifies under this tariff item as limestone of a kind used for lime manufacture, given its high purity and intended use.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the product is already converted to calcium carbonate
Precipitated calcium carbonate is a chemical product of chapter 28, not raw stone.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify the limestone is not mixed with other substances, as mixing would exclude it from chapter 25
• Provide a certificate of analysis to confirm purity and intended use for lime production
• Use the correct unit of measure (tonnes) for customs declarations
Related Products under Tariff item 2521.00.00
Cement Kiln Feed Limestone
Cement kiln feed limestone is a medium-to-coarse crushed calcareous rock selected for its consistent calcium carbonate content, used directly in rotary kilns for clinker production. It falls under this tariff item as calcareous stone of a kind used for the manufacture of cement, as permitted by the chapter notes for crushed or ground products.
Fluxing Calcareous Stone for Steel Mills
Fluxing calcareous stone for steel mills is coarse angular stone sized 1-4 inches, used in basic oxygen furnaces to form slag. It falls under this tariff item as limestone flux, a calcareous stone used for lime-related industrial processes, and is not processed beyond crushing or sizing.
Glass Manufacturing Calcareous Stone
Glass manufacturing calcareous stone is used in soda-lime glass production to stabilize the network. It is classifiable under this tariff item as calcareous stone of a kind used for lime manufacture, since the soda-lime process involves lime as a key component, and the stone is not processed beyond crushing.
High-Calcium Limestone Flux
High-calcium limestone flux is coarsely crushed stone with at least 95% calcium carbonate, used in blast furnaces to remove impurities. It falls under this tariff item as limestone flux, a calcareous stone for lime-related metallurgical processes, and is not processed beyond crushing or screening.
Hydrated Lime Manufacturing Limestone
Hydrated lime manufacturing limestone is high-brightness stone suitable for producing hydrated lime for construction and chemicals. It falls under this tariff item as raw material expressly for lime production, and is not processed beyond crushing or grinding per chapter note 1.
Lime Production Quarry Limestone
Lime production quarry limestone is quarry-run blocks or crushed stone from high-purity deposits, intended for quicklime production via calcination. It is classifiable under this tariff item as calcareous stone of a kind used for lime manufacture, as it is in crude or crushed state.