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.
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 aluminous cement
Milled aluminous clinker powder is finished cement under the specific aluminous subheading.
If sintered into refractory bricks
High-alumina clinker fired into shaped refractories moves to Chapter 69 for ceramic products.
If sold as prepared refractory cement mix
Clinker blended with binders for immediate use classifies as chemical preparations, not raw clinkers.
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Import Tips & Compliance
• Include bauxite content certification (>30% Al2O3) to distinguish from Portland clinker and support hydraulic cement classification
• Declare intended end-use in refractory mixes if applicable, but note clinkers remain under 2523 regardless of use
Related Products under HTS 2523.10.00.00
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.
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.