Other
Refractory bricks, blocks, tiles and similar refractory ceramic constructional goods, other than those of siliceous fossil meals or similar siliceous earths: > Containing by weight, singly or together, more than 50 percent of the elements magnesium, calcium or chromium, expressed as MgO, CaO or Cr2O3: > Other
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 6902.10.50.00
Magnesia-Herringbone Refractory Bricks
Herringbone-patterned magnesia bricks with >50% MgO for improved gas flow in tunnel kilns and reheating furnaces. The angled design prevents brick movement under thermal cycling. HTS 6902.10.50.00 classification for magnesium refractory bricks.
Rebonded Fused Magnesia Chrome Bricks
Ultra-high purity bricks made from rebonded fused magnesia-chrome grains with aggregate >50% MgO/Cr2O3, for electric arc furnace roofs. Exceptional service life in severe conditions. Covered by HTS 6902.10.50.00 as premium refractory bricks.
High Purity Magnesia Refractory Shapes
Custom-shaped refractory components with 95%+ MgO content for specialized furnace zones like ladle impact pads. Precision fired to maintain dimensional stability. HTS 6902.10.50.00 for high magnesium oxide refractory goods.
Calcium Ferrite Refractory Bricks
Refractory bricks incorporating calcium ferrite phases with >50% CaO equivalent for waste incinerator linings. Resistant to alkali corrosion from flue gases. Classifies HTS 6902.10.50.00 for high calcium oxide refractories.
Magnesia-Dolomite Composite Refractory Blocks
Composite blocks blending magnesia and dead-burned dolomite achieving >50% combined MgO/CaO for basic oxygen furnace linings. Balanced chemistry for steelmaking slags. HTS 6902.10.50.00 classification applies.
Chromium-Corundum Refractory Bricks
High-chrome corundum bricks with Cr2O3>50% for glass furnace superstructures resisting batch carryover. Dense microstructure prevents glass penetration. Covered by HTS 6902.10.50.00 for chromium oxide dominant refractories.
Magnesia-Chrome Taphole Bricks
Specialized refractory bricks for blast furnace tap-holes with >50% MgO/Cr2O3 composition resisting molten iron and slag abrasion. Conically shaped for precise fit. HTS 6902.10.50.00 for refractory constructional goods.
Magnesia-Chrome Refractory Bricks
High-density refractory bricks composed of more than 50% MgO and Cr2O3, fired after shaping to withstand extreme temperatures in industrial furnaces. These bricks are used in rotary kilns and non-ferrous metal smelters for their superior corrosion resistance. Classified under HTS 6902.10.50.00 due to high magnesium and chromium oxide content and refractory properties.
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. Meets HTS 6902.10.50.00 as 'other' refractory goods with dominant calcium oxide.
Chromite-Magnesite Refractory Tiles
Fired ceramic tiles containing >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. Classified in 6902.10.50.00 for refractory tiles not of siliceous earths.
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 provide basic slag resistance essential for secondary steelmaking. HTS 6902.10.50.00 covers these as 'other' high Mg/Ca oxide refractories.
Magnesia Spinel Refractory Blocks
Pre-fired blocks combining magnesia with spinel (MgAl2O4) where MgO exceeds 50%, used in cement kiln burning zones. Offers superior thermal spalling resistance. Falls under HTS 6902.10.50.00 for magnesium-dominant refractory constructional goods.
Chrome-Magnesite Checker Bricks
Perforated checker bricks with >50% Cr2O3 and MgO for regenerative heat recovery in glass and metallurgical furnaces. The lattice structure maximizes heat exchange efficiency. Classified HTS 6902.10.50.00 as refractory bricks of specified oxide composition.
Direct-Bonded Magnesia Chrome Bricks
Premium refractory bricks produced by direct bonding of magnesia and chrome ore grains, with >50% MgO/Cr2O3, for RH degasser vessels in steelmaking. Exceptional creep resistance at high temperatures. HTS 6902.10.50.00 for other high Mg/Cr refractories.
Calcium Aluminate Refractory Anchor Tiles
Specialty anchor tiles with high CaO content for securing fiber modules in furnace linings, containing >50% CaO. Designed for easy installation in high-temperature applications. Classifies under 6902.10.50.00 as refractory constructional tiles.