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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If ground supersulfate finished cement
Powdered form with gypsum integration is classified as finished supersulfate cement.
If excess gypsum content dominating
Clinkers with >70% calcined gypsum shift to gypsum preparations.
If packaged as ready-to-use sulfate-resistant mix
Prepared cement compositions for retail fall under chemical preparations.
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Import Tips & Compliance
• Document gypsum and slag ratios (>50% combined) to confirm supersulfate type and hydraulic classification
• Use ventilated containers to prevent moisture absorption, which could alter clinker properties and classification
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.
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.
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.