Cement Kiln Feed Limestone from China
Cement kiln feed limestone consists of medium-to-coarse crushed calcareous rock selected for its consistent calcium carbonate levels, fed directly into rotary kilns for clinker production. It qualifies for HTS 2521.00.00.00 as limestone expressly used in cement manufacturing. The material's purity ensures optimal lime reactivity during calcination.
Duty Rate — China → United States
35%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Import Tips
• Provide lab assays confirming low impurity levels (e.g
• <2% silica, alumina) to support 'kind used for cement' classification
• Include end-user letters from cement producers specifying the limestone's intended kiln application
• Avoid common pitfall of particle size uniformity claims that could reclassify as precast concrete aggregate under 2517