Chapter 2523 — Customs Tariff Headings

2523.2Portland cement:

2523.30.00Aluminous cement

2523.90.00Other hydraulic cements

Calculate exact duty for your shipment Not sure about classification? Ask the Tariff Assistant

Products classified under Tariff item 25.23

Aluminous Cement Clinker

Aluminous cement clinker, also known as high-alumina clinker, is produced by sintering bauxite and limestone at high temperatures. It is a hydraulic cement clinker in its unground state, falling under this tariff item as the primary product before further processing into cement.

Low-Alkali Cement Clinker

Low-alkali cement clinker is a type of Portland cement clinker with reduced alkali content, specifically designed to prevent alkali-silica reactions in concrete. As an unground clinker, it falls under this tariff item for hydraulic cement clinkers.

Oil Well Cement Clinker

Oil well cement clinker is a hydraulic cement clinker engineered for high-pressure and high-temperature oilfield applications, conforming to specific API Class grades. In its unground clinker form, it falls under this tariff item before final grinding to API specifications.

Portland Cement Clinker

Portland cement clinker is the intermediate product formed by sintering limestone and clay at high temperatures, primarily composed of calcium silicates. As the unground form of hydraulic cement, it falls directly under this tariff item for cement clinkers.

Slag Cement Clinker

Slag cement clinker is produced by blending blast furnace slag with Portland clinker components, offering enhanced sulfate resistance. As an unground clinker, it falls under this tariff item for hydraulic cement clinkers before final grinding into blended cement.

Supersulfate Cement Clinker

Supersulfate cement clinker combines Portland clinker with high ratios of calcined gypsum and slag, providing extreme sulfate resistance. In its unground clinker form, it falls under this tariff item for hydraulic cement clinkers prior to final grinding.

White Portland Cement Clinker

White Portland cement clinker is manufactured from low-iron raw materials, resulting in a light-colored clinker used for aesthetic concrete applications. As the unground clinker form, it falls under this tariff item before being ground into white cement.

Architectural White Cement

Premium white Portland cement engineered for exposed architectural concrete, with optimized fineness for smooth finishes and low heat of hydration. Its high whiteness and hydraulic properties qualify it under tariff item 2523.21.00 as white cement, whether or not artificially coloured.

Artificially Colored White Cement - Ivory Shade

White Portland cement artificially coloured to an ivory shade using iron-free pigments, designed for precast elements requiring specific architectural palettes. The artificial colouring is explicitly covered by tariff item 2523.21.00, which includes white cement whether or not artificially coloured.

Decorative White Cement with Blue Tint

White cement with blue pigment for artistic terrazzo and stained concrete applications, retaining hydraulic setting properties. Tariff item 2523.21.00 explicitly covers white cement that is artificially coloured, making this product classifiable here.

High Early Strength White Cement

White Portland cement formulated for rapid setting in precast production, achieving high strength within hours while preserving white colour. Its hydraulic properties and white appearance place it under tariff item 2523.21.00 as white cement, regardless of early strength characteristics.

White Cement Clinkers

White cement clinkers, intermediate nodules from kiln firing of low-iron raw materials, ground into finished white Portland cement. As clinkers are the crude form of white cement, they fall under tariff item 2523.21.00, which covers white cement in clinker form.

White Portland Cement

White Portland cement produced from raw materials with low iron content, resulting in its characteristic white colour, suitable for architectural and decorative applications. This product squarely meets the description of tariff item 2523.21.00 for white cement.

White Supersulfate Cement

White supersulfate cement combining Portland clinker with high sulfate content for sulfate resistance, maintaining white colour through low-iron components. Although supersulfate cement is generally in heading 25.23, tariff item 2523.21.00 specifically covers white cement, and this product's white hydraulic nature qualifies it here.

ASTM C150 Type III Portland Cement

ASTM C150 Type III Portland cement is a high early strength cement with optimized fineness, designed for rapid strength gain in cold weather concreting and precast applications. It falls under this tariff item as 'other' Portland cement, not being white Portland cement or clinkers.

General Use Portland Cement GU

General Use (GU) Portland cement, equivalent to Type I/II, is a versatile hydraulic cement for most construction applications, including residential and commercial buildings. It is classified as 'other' Portland cement under this tariff item, excluding white cement and clinkers.

Grey Portland Cement Bulk Powder

Grey Portland cement in bulk powder form, typically Type I composition, is transported via pneumatic tankers for use in large ready-mix plants. This product falls under 'other' Portland cement, as it is not white cement or in clinker form.

High Early Strength Portland Cement

High Early Strength (HES) Portland cement is a finely ground cement with adjusted chemistry for rapid setting, ideal for road repairs and accelerated construction. It is classified as 'other' Portland cement under this tariff item, not being white or clinker.

Ordinary Portland Cement OPC 43 Grade

OPC 43 Grade is Ordinary Portland Cement with a minimum compressive strength of 43 MPa at 28 days, used for general construction like pavements and mass concrete. It falls under this tariff item as 'other' Portland cement, excluding white cement and clinkers.

Portland Cement in 50kg Bags

Standard Portland cement packaged in 50kg polypropylene bags for retail sale, containing Type I/II mix, is classified as 'other' Portland cement. Packaging does not affect the tariff classification, as it is still a hydraulic cement under this heading.

Type II Portland Cement

Type II Portland cement is moderately sulfate-resistant, suitable for structures exposed to moderate sulfate action or seawater, with controlled C3A content. It is classified as 'other' Portland cement under this tariff item, not being white or clinker.

Type IL Portland-Limestone Cement

Type IL Portland-limestone cement contains up to 15% limestone interground with clinker, offering similar performance to traditional Portland with a lower CO2 footprint. It falls under 'other' Portland cement, as it is not white cement or clinkers.

Type I Portland Cement

Type I Portland cement is a general-purpose hydraulic cement produced by grinding clinker with gypsum, suitable for a wide range of construction applications. It is classified as 'other' Portland cement under this tariff item, excluding white cement and clinkers.

Type V Portland Cement

Type V Portland cement offers high sulfate resistance for severe exposure conditions like sewage treatment plants and sulfate-rich soils, with very low tricalcium aluminate. It falls under 'other' Portland cement, not being white or clinker.

Aluminous Expansion Cement

Aluminous expansion cement is a hydraulic cement based on calcium aluminate that generates controlled expansion during setting, making it suitable for precision grouting and anchoring. It falls under tariff item 2523.30.00 as an aluminous cement, which is defined by its calcium aluminate composition and hydraulic properties.

Calcium Aluminate Cement Powder

Calcium aluminate cement powder is an aluminous cement used in rapid-hardening concrete and repair mortars, offering superior sulfate resistance and fast setting. It is classified under tariff item 2523.30.00 because its primary component is calcium aluminate, which defines aluminous cement.

Fondu Aluminous Cement

Fondu aluminous cement is a high-purity calcium aluminate cement used in specialty concretes and castables, known for quick setting properties. It qualifies under tariff item 2523.30.00 as an aluminous cement due to its calcium aluminate base.

High-Alumina Refractory Cement

High-alumina refractory cement is a hydraulic cement composed primarily of calcium aluminate, designed for high-temperature applications in furnaces and kilns. It falls under tariff item 2523.30.00 as aluminous cement, provided it is not a refractory mix excluded by Chapter 25 Note 2.

Rapid-Set Aluminous Cement Clinker

Rapid-set aluminous cement clinker is an intermediate product ground into finished cement, containing high aluminates. It is classified under tariff item 2523.30.00 whether in clinker or powder form, as the heading covers aluminous hydraulic cements in both forms.

Sulfuric-Resistant Aluminous Cement

Sulfuric-resistant aluminous cement is formulated for aggressive environments like sewers and wastewater structures, with high alumina content providing excellent resistance. It qualifies under tariff item 2523.30.00 as a hydraulic aluminous cement, as its composition and properties align with the heading.

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.