Other hydraulic cements
Portland cement, aluminous cement, slag cement, supersulphate cement and similar hydraulic cements, whether or not coloured or in the form of clinkers. > Portland cement: > Other hydraulic cements
Duty Rate (from China)
Subheadings
Products classified under Tariff item 2523.90.00
Calcium Aluminate Cement
Calcium aluminate cement is a hydraulic binder made from limestone and bauxite, offering high early strength and resistance to chemical attack. It sets and hardens through hydration reactions, distinct from Portland cement, and is used in refractory and rapid-repair applications. This product falls under tariff item 2523.90.00 as 'other hydraulic cements' because it is not a Portland, aluminous, slag, or supersulphate cement.
Colored Hydraulic Lime Cement
Colored hydraulic lime cement is a hydraulic binder mixed with iron oxide pigments for aesthetic restoration projects. It sets through hydration of free lime and other compounds, providing a durable, breathable material. This product is classified under 2523.90.00 as 'other hydraulic cements' because it is not a standard Portland or aluminous cement, and the added pigments do not exclude it from Chapter 25.
Expansive Hydraulic Cement
Expansive hydraulic cement is formulated with ettringite-forming agents to compensate for shrinkage in concrete, ensuring crack control in prestressed structures. It hardens through hydration, similar to other hydraulic cements, but has unique expansive properties. This product is classified under 2523.90.00 as 'other hydraulic cements' because it does not fit the definitions of Portland, aluminous, slag, or supersulphate cements.
High Alumina Cement
High alumina cement is a hydraulic binder made from bauxite and limestone, known for rapid hardening and high-temperature resistance. It sets and hardens in air or underwater through hydration of calcium aluminates. This product is classified under 2523.90.00 as 'other hydraulic cements' because it is not a Portland cement, and while it is aluminous, it is not specifically classified under the aluminous cement subheading if it does not meet the exact definition.
Masonry Hydraulic Cement
Masonry hydraulic cement is a blend of natural cement and limestone, designed for tuckpointing and restoration work, setting hydraulically. It provides a durable, breathable mortar that matches historic structures. This product is classified under 2523.90.00 as 'other hydraulic cements' because it is not a standard Portland cement and has unique properties for masonry applications.
Natural Cement Clinker Ground
Ground natural cement is produced from argillaceous limestone kilns, providing hydraulic setting similar to Roman concrete. It is used in sustainable historic restoration projects. This product is classified under 2523.90.00 as 'other hydraulic cements' because it is a natural hydraulic cement, distinct from synthetic Portland cement.
Pozzolanic Hydraulic Cement Blend
Pozzolanic hydraulic cement blend consists of Portland clinker (less than 50%), fly ash, and gypsum, setting through pozzolanic reactions. It offers a low-carbon alternative for sustainable construction. This product is classified under 2523.90.00 as 'other hydraulic cements' because it does not meet the definition of Portland cement due to the low clinker content.
Roman-Type Hydraulic Cement
Roman-type hydraulic cement replicates ancient pozzolanic cement using volcanic ash and lime, setting underwater like Roman opus caementicium. It is used in marine and archaeological restoration projects. This product is classified under 2523.90.00 as 'other hydraulic cements' because it is a blended hydraulic cement, not a standard Portland or aluminous type.
Sorel Cement Powder
Sorel cement powder is a magnesium oxide-based hydraulic cement that sets with magnesium chloride solution, used for flooring and industrial applications. It is chemically distinct from traditional cements but exhibits hydraulic properties. This product is classified under 2523.90.00 as 'other hydraulic cements' because it is a hydraulic binder not covered by other subheadings.
Supersulfated Cement Powder
Supersulfated cement powder is a hydraulic cement that develops strength through sulfate reactions, using granulated slag, gypsum, and calcium sulfate. It is related to slag cements but has unique formulations. This product is classified under 2523.90.00 as 'other hydraulic cements' because it does not meet the exact definition of slag cement under heading 2523.