Pozzolanic Hydraulic Cement Blend
Blend of Portland clinker (<50%), fly ash, and gypsum creating hydraulic set via pozzolanic reaction. HTS 2523.90.00.00 for such composite other hydraulics. Sustainable alternative for low-carbon concrete.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If higher Portland clinker content
Blends with majority Portland clinker classify as Portland types.
If pure fly ash import without cement
Dross/scoria/ash separate from Chapter 25; blending makes hydraulic cement.
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Import Tips & Compliance
• Clinker fraction analysis critical; >50% becomes Portland cement
• Fly ash quality certs (Class F/C) required for green building claims
• Avoid declaring as 'slag substitute' which confuses with 2523.28
Related Products under HTS 2523.90.00.00
High Alumina Cement
High alumina cement is a hydraulic cement produced from bauxite and limestone, capable of setting and hardening underwater or in air due to its aluminous composition. It falls under HTS 2523.90.00.00 as 'other hydraulic cements' distinct from Portland, slag, or supersulfate types. Primarily used in refractory applications and rapid-strength concrete.
Calcium Aluminate Cement
Calcium aluminate cement is a specialized hydraulic binder with high early strength, made from limestone and alumina-bearing materials. Classified in HTS 2523.90.00.00 as other hydraulic cements, not fitting Portland or supersulfate categories. Ideal for sewer pipe linings and aggressive chemical environments.
Supersulfated Cement Powder
Though related to slag cements, certain supersulfated formulations with unique gypsum-calcium sulfate ratios qualify as 'other' under HTS 2523.90.00.00. This hydraulic cement develops strength through sulfate reactions, suitable for marine structures. Excluded from pure slag cement (2523.28) by composition specifics.
Roman-Type Hydraulic Cement
Replicated pozzolanic hydraulic cement using volcanic ash and lime, sets underwater like ancient Roman opus caementicium. HTS 2523.90.00.00 as other hydraulic due to blended hydraulic properties. Applied in marine and archaeological restoration.
Colored Hydraulic Lime Cement
Hydraulic lime cement with iron oxide pigments for aesthetic matching in restoration, hydraulically sets via free lime. Classed HTS 2523.90.00.00 as other colored hydraulic cement. Not excluded by chapter notes on earth colors.
Sorel Cement Powder
Magnesium oxide-based hydraulic cement (Sorel) that sets with magnesium chloride solution, used for flooring. Though chemically distinct, classified HTS 2523.90.00.00 as other hydraulic when sold as powder. Not magnesium oxide crystals excluded by chapter note.