Portland Cement Clinker
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If ground into finished Portland cement
Ground clinker with added gypsum becomes finished hydraulic cement, classified under the subheading for Portland cement rather than raw clinkers.
If chemically modified or prepared with non-cementitious additives
Clinkers treated with chemical admixtures or non-hydraulic modifiers fall under prepared binders, not pure cement clinkers.
If formed into cement tiles or blocks
Clinker processed into shaped articles like tiles shifts to Chapter 68 for cement-based construction products.
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Import Tips & Compliance
• 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
Related Products under HTS 2523.10.00.00
Aluminous Cement Clinker
Aluminous cement clinker, also known as high-alumina clinker, is produced from bauxite and limestone, offering rapid hardening and heat resistance. Classified under HTS 2523.10.00.00 as a hydraulic cement clinker before grinding. Used in refractory applications and high-temperature concretes.
Slag Cement Clinker
Slag cement clinker is produced by blending blast furnace slag with Portland clinker components, providing sulfate resistance. It is the unground clinker form under HTS 2523.10.00.00, destined for grinding into blended hydraulic cement.
Supersulfate Cement Clinker
Supersulfate cement clinker combines Portland clinker with high ratios of calcined gypsum and slag for extreme sulfate resistance. Classified as hydraulic cement clinker under HTS 2523.10.00.00 prior to final grinding.
White Portland Cement Clinker
White Portland cement clinker is made from low-iron raw materials, resulting in a light-colored clinker for aesthetic concrete applications. It is the raw clinker form under HTS 2523.10.00.00, ground later into white cement.
Oil Well Cement Clinker
Oil well cement clinker is engineered for high-pressure, high-temperature oilfield applications with specific API Class grades. It qualifies as hydraulic cement clinker under HTS 2523.10.00.00 before grinding to API specifications.
Low-Alkali Cement Clinker
Low-alkali cement clinker limits alkali content (<0.6% Na2O equivalent) to prevent alkali-silica reaction in concrete. As unground clinker, it falls under HTS 2523.10.00.00 for hydraulic cements.