Portland Cement Clinker from Mexico
Portland cement clinker is the intermediate product produced by sintering limestone and clay at high temperatures, consisting primarily of calcium silicates. It falls under HTS 2523.10.00.00 as it is the unground form of clinker used for manufacturing Portland cement by further grinding with gypsum. This classification applies to clinkers not yet processed into finished hydraulic cement.
Duty Rate — Mexico → United States
10%
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
Import Tips
• Verify clinker composition meets ASTM C150 standards for Portland cement precursors to ensure proper classification and avoid reclassification as finished cement
• Provide mill test certificates documenting chemical analysis (e.g
• free lime content <2%) and bulk density to customs for valuation and duty assessment