2521.00.00.00/High-Calcium Limestone Flux/Germany

High-Calcium Limestone Flux from Germany

High-calcium limestone flux is a coarsely crushed calcareous stone with at least 95% calcium carbonate content, specifically used in blast furnaces to remove impurities during steel production. It falls under HTS 2521.00.00.00 because it is limestone of a kind used for lime or cement manufacture, distinguished by its chemical purity and fluxing properties. This raw material is essential for slag formation in metallurgical processes.

Duty Rate — Germany → United States

10%

Rate breakdown

9903.05.3910%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.97, articles the product of a member state of the European Union, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 10 percent, as provided for in U.S. note 52 to this subchapter

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Import Tips

• Verify chemical composition certificates showing high CaO content to confirm classification under 2521.00.00.00 and avoid misclassification as general crushed stone

• Ensure documentation specifies end-use for lime/cement manufacture, as flux properties must be evidenced for duty-free entry in some cases

• Watch for particle size specs; overly processed stone may shift to heading 2522 if not raw flux material