Alumina-Silica Refractory Block
Dense refractory blocks with a mixture of >50% Al2O3 and SiO2, fired for lining blast furnaces and incinerators. They withstand extreme temperatures and chemical erosion in metallurgical processes. Falls under 6902.20.50 as 'other' refractory bricks/blocks beyond basic siliceous types.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If derived from siliceous fossil meals or earths
Siliceous fossil meal-based products have priority classification over alumina content.
If for non-block shapes like special refractory shapes
6903 covers other refractory constructional goods not fitting bricks/blocks/tiles.
If used in non-refractory construction applications
Lower-spec ceramic building bricks without high refractory properties go to 6904.
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Import Tips & Compliance
• Include manufacturer's spec sheets showing weight percent of Al2O3/SiO2 exceeding 50%
• Declare exact dimensions to confirm not qualifying as 'tiles' under US notes
• Watch for reclassification to 6909 if absorption exceeds refractory limits
Related Products under HTS 6902.20.50
High-Alumina Refractory Firebrick
High-alumina refractory firebricks containing over 50% Al2O3, fired after shaping for use in high-temperature furnaces and kilns. These bricks provide excellent thermal shock resistance and corrosion resistance in industrial applications like steelmaking. Classified under 6902.20.50 as refractory ceramic constructional goods other than siliceous fossil meals.
Magnesia-Alumina Refractory Brick
Refractory bricks blending >50% Al2O3 with magnesia for basic oxygen furnace linings, fired to high temperatures. Offers superior slag resistance in steel production. HTS 6902.20.50 applies to these 'other' high-alumina/silica content refractory bricks.
Silica-Alumina Anchor Brick
Specialty anchor bricks with >50% SiO2 and Al2O3 mixture, fired for securing fiber modules in industrial furnaces. Designed for high-temperature suspension systems. Classified in 6902.20.50 as other refractory constructional bricks.
High-Purity Alumina Refractory Tile
Fired ceramic tiles with >70% Al2O3 content for lining rotary kilns in cement production. Provides abrasion resistance at temperatures over 1600°C. HTS 6902.20.50 covers these as 'other' refractory tiles.
Checker Refractory Brick
Honeycomb-structured bricks with >50% alumina-silica composition, fired for heat recuperators in glass furnaces. Enables efficient heat recovery through alternating passageways. 6902.20.50 classification for these specialized refractory bricks.
Slide Gate Refractory Block
Precision-fired blocks with high alumina content (>60% Al2O3) for molten steel slide gate valves in continuous casting. Resists thermal shock and erosion from liquid metal. Covered by 6902.20.50 as other refractory constructional blocks.