Chapter 6902 — Customs Tariff Headings

Calcium Aluminate Refractory Anchor Tiles

Specialty anchor tiles with high CaO content for securing fiber modules in furnace linings, containing over 50% CaO. Designed for easy installation in high-temperature applications.

Calcium Ferrite Refractory Bricks

Refractory bricks incorporating calcium ferrite phases with over 50% CaO equivalent for waste incinerator linings. These bricks resist alkali corrosion from flue gases.

Chrome-Magnesite Checker Bricks

Perforated checker bricks with over 50% Cr2O3 and MgO for regenerative heat recovery in glass and metallurgical furnaces. The lattice structure maximizes heat exchange efficiency.

Chromite-Magnesite Refractory Tiles

Fired ceramic tiles containing over 50% combined MgO and Cr2O3, designed for lining glass tank furnaces and copper smelters. These tiles offer excellent slag resistance and are thinner than blocks for curved surfaces.

Chromium-Corundum Refractory Bricks

High-chrome corundum bricks with Cr2O3 over 50% for glass furnace superstructures resisting batch carryover. The dense microstructure prevents glass penetration.

Direct-Bonded Magnesia Chrome Bricks

Premium refractory bricks produced by direct bonding of magnesia and chrome ore grains, with over 50% MgO/Cr2O3, for RH degasser vessels in steelmaking. These bricks offer exceptional creep resistance at high temperatures.

Direct-Bonded Magnesite Brick for Electric Arc Furnaces

Direct-bonded magnesite refractory bricks containing over 93% MgO, fired at high temperatures for use in electric arc furnace walls. These bricks provide superior slag resistance and maintain structural integrity under thermal shock and corrosion.

Dolomite Refractory Bricks

Refractory bricks derived from fired dolomite with high CaO and MgO content exceeding 50%, used in steel ladles and electric arc furnaces. These bricks provide basic slag resistance essential for secondary steelmaking.

Fused Magnesia Brick for Glass Tank Regenerators

Fused magnesia refractory bricks made with electrofused grains, designed for glass tank regenerator checkers. These bricks are fired after shaping from high-purity magnesia and offer superior thermal shock resistance.

High-Calcium Aluminate Refractory Blocks

Large refractory blocks with over 50% CaO content, fired for use in cement rotary kilns and lime kilns. These constructional goods provide thermal shock resistance and are shaped for furnace linings.

High-Density Magnesite Brick for Cement Rotary Kilns

High-density magnesite bricks with over 90% MgO, fired for use in cement rotary kilns. These bricks provide alkali and abrasion resistance essential for high-temperature clinker production environments.

Magnesia-Carbon Brick for Steel Ladle Impact Pads

Magnesia-carbon refractory bricks for steel ladle impact zones, combining over 80% MgO with graphite for erosion resistance. These are fully fired ceramic constructional goods.

Magnesia-Chrome Brick for Non-Ferrous Metal Smelting

Magnesia-chrome refractory bricks with over 50% combined MgO and Cr2O3, used in copper and aluminum smelting furnaces. These fired ceramic goods resist basic slags and high temperatures.

Magnesia Ramming Mix Brick for Induction Furnaces

Pre-formed magnesite bricks made from ramming mixes for coreless induction furnace linings, fired to a service limit above 1600°C. High MgO content resists molten iron attack.

Magnesia Refractory Brick for Steel Ladles

High-purity magnesite bricks containing over 90% MgO, fired after shaping for lining steel ladles. These refractory bricks withstand extreme temperatures above 1700°C and resist molten steel slag.

70% Alumina Kiln Brick

A kiln brick composed of 70% alumina, designed for pottery and glass kilns, providing superior refractoriness. It is shaped and fired to maintain structural integrity at temperatures exceeding 1700°C, making it a refractory ceramic constructional good.

70% Alumina Refractory Brick

A standard 70% Al2O3 refractory brick fired for use in glass tank regenerator checkers and cement kilns. It is a constructional ceramic good exceeding 50% alumina, meeting the requirements of this tariff item.

90% Alumina Refractory Brick

A refractory brick composed of 90% alumina for superior thermal shock resistance in high-heat environments. It is a fired ceramic constructional good shaped for boiler and incinerator linings, meeting the requirements of this tariff item.

Blast Furnace Alumina Brick

A heavy-duty alumina brick containing more than 50% Al2O3, used for blast furnace hot blast stove checker chambers. Its refractory properties resist slag erosion and high thermal loads, making it a constructional refractory ceramic good.

Chrome-Alumina Refractory Brick

A direct-bonded chrome-alumina brick with more than 50% Al2O3 and chromic oxide, used for glass furnace regenerator checkers. It offers exceptional corrosion resistance to glass melts, qualifying as a refractory ceramic constructional good.

Glass Tank Alumina Furnace Brick

Alumina-rich bricks with more than 50% Al2O3, used for glass melting tank furnaces, offering resistance to molten glass corrosion. These refractory constructional ceramics are fired after shaping, qualifying under this tariff item.

High-Alumina Firebrick

A high-alumina firebrick containing over 50% alumina (Al2O3), fired after shaping for high-temperature resistance. It is used in furnaces and kilns for lining to withstand extreme heat, making it a constructional refractory good.

High-Alumina Refractory Firebrick

A high-alumina refractory firebrick containing over 50% alumina (Al2O3), fired after shaping for high-temperature resistance. It is used in furnaces and kilns for lining to withstand extreme heat without deforming, making it a constructional refractory good.

Insulating Alumina Refractory Brick

A lightweight insulating brick with more than 50% alumina and a porous structure, used for furnace backup insulation. It is a fired ceramic with low thermal conductivity at high temperatures, qualifying as a refractory constructional good.

Kiln Car Alumina Brick

Heavy-duty alumina bricks with more than 50% Al2O3, used for kiln car tops and supports in ceramic firing kilns. They provide structural stability at high temperatures post-firing, qualifying as refractory constructional goods.

Phosphate-Bonded Alumina Brick

Refractory bricks using phosphate binders with more than 50% alumina for improved strength in backup linings. They meet Chapter 69 firing requirements using inorganic nonmetallic materials, qualifying as constructional refractory goods.

Rotary Kiln Alumina Lining Brick

Specialized bricks with high alumina content for lining rotary cement kilns, resisting abrasion and alkali attack. They are fired inorganic nonmetallic ceramics per the chapter definition, qualifying as constructional refractory goods.

Rotary Kiln Alumina-Silica Brick

A refractory brick blending alumina and silica with more than 50% total content, used for cement rotary kiln burning zones. It is fired to achieve high density and abrasion resistance, making it a constructional refractory ceramic good.

Silica-Alumina Refractory Brick

A refractory brick with more than 50% combined silica (SiO2) and alumina, engineered for blast furnace linings. It is a fired ceramic construction that withstands thermal shock and corrosion from molten materials, qualifying under this tariff item.

Steel Ladle Alumina Brick

A high-purity alumina brick with more than 60% Al2O3, used for steel ladle impact pads and purge plugs. It is fired to resist molten steel and slag penetration, making it a constructional refractory ceramic good.

90% Alumina Refractory Bricks

90% alumina refractory bricks are high-purity ceramic constructional goods fired after shaping, designed for critical zones in aluminum smelters and cement kilns. Their high fired density and resistance to molten metal and alkali corrosion qualify them as refractory ceramic products under this tariff item.

Andalusite Refractory Bricks

Andalusite refractory bricks are fired ceramic constructional goods that incorporate andalusite to form mullite, offering excellent thermal shock resistance for coke ovens and reheat furnaces. Their dimensional stability and high-temperature performance place them under this tariff item for other refractory bricks.

Bauxite-Based Refractory Bricks

Bauxite-based refractory bricks are fired ceramic constructional goods made from calcined bauxite aggregate, providing economical high-duty performance for rotary cement kilns. Their spinel bonding developed during firing enhances slag penetration resistance, classifying them under this tariff item.

Chrome-Magnesite Refractory Bricks

Chrome-magnesite refractory bricks are fired ceramic constructional goods blending chrome ore with dead-burned magnesite, offering superior resistance to ferrous slags in electric arc furnaces. Their balanced properties for steel ladle linings qualify them as other refractory bricks under this tariff item.

Direct-Bonded Magnesia Refractory Bricks

Direct-bonded magnesia refractory bricks are fired ceramic constructional goods achieving high purity through high-temperature firing that creates ceramic bonding between periclase grains. Used in converter mouths and hot metal ladles, they fall under this tariff item for other refractory bricks.

Electrocast Refractory Blocks (Brick Size)

Electrocast refractory blocks in brick size are fired ceramic constructional goods melted and cast via electric arc, producing a bubble-free high-alumina structure for glass crown applications. Their seamless microstructure and standard brick dimensions classify them under this tariff item.

Fireclay Refractory Bricks

Fireclay refractory bricks are fired ceramic constructional goods made from high-temperature-fired clay with 30-45% alumina, serving as general-purpose linings in boilers and incinerators. Their cost-effective thermal insulation and slag resistance place them under this tariff item.

High Alumina Refractory Bricks

High alumina refractory bricks are fired ceramic products composed primarily of aluminum oxide, designed to withstand temperatures exceeding 1700°C. Used in furnace linings and kilns for superior thermal performance, they qualify as other refractory bricks under this tariff item.

Insulating Firebrick (IFB) 26 Grade

IFB 26 grade insulating firebricks are fired ceramic constructional goods with low thermal conductivity due to high porosity, made from clay-kaolin mixes for backup furnace insulation. Their service limit around 1430°C makes them suitable for energy-efficient linings under this tariff item.

Low Porosity Fireclay Bricks

Low porosity fireclay bricks are fired ceramic constructional goods that minimize slag penetration in blast furnace stove checkers through a dense vitrified structure from high firing. Their balance of insulation and strength classifies them under this tariff item for other refractory bricks.

Magnesia Chrome Refractory Bricks

Magnesia chrome refractory bricks are fired ceramic constructional goods combining magnesium oxide and chromite for extreme resistance to basic slags in steelmaking furnaces. Maintaining structural integrity up to 2000°C, they fall under this tariff item for other refractory bricks.

Phosphate-Bonded High Alumina Bricks

Phosphate-bonded high alumina refractory bricks use phosphoric acid binders fired to develop mullite-phosphate bonds for abrasion resistance in cyclone burners. Their enhanced strength at elevated temperatures qualifies them as other refractory bricks under this tariff item.

Silicon Carbide Refractory Bricks

Silicon carbide refractory bricks are fired ceramic constructional goods featuring SiC grains bonded in a fired ceramic matrix, offering excellent thermal conductivity and abrasion resistance for blast furnace applications. Their durability in aggressive environments places them under this tariff item.

Silimanite Refractory Bricks

Silimanite refractory bricks are fired ceramic constructional goods using high-alumina sillimanite minerals for creep-resistant performance in glass tank regenerator checkers. Their fired structure handles 1600°C+ with minimal deformation, classifying them under this tariff item.