High-Alumina Refractory Firebrick
High-alumina refractory firebricks are ceramic bricks composed primarily of alumina, fired at high temperatures to withstand extreme heat above 1500°C. They are used in furnace linings and kilns for their excellent thermal shock resistance and corrosion resistance. Classified under HTS 6902.90.50 as refractory ceramic constructional goods other than siliceous fossil meals, due to their fired ceramic composition for high-temperature industrial applications.
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More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing more than 50% alumina by weight
High-alumina content shifts classification to specific subheading for alumina-based refractories within the same heading group.
If containing chromite or magnesite
Different raw material composition like chromite places it under heading 6903 for other refractory bricks.
If not fired after shaping or used as millstones
Articles not meeting Chapter 69 firing requirements fall under Chapter 68 as worked stone or grinding materials.
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Import Tips & Compliance
• Verify firing temperature exceeds 800°C and provide manufacturer specs confirming refractory properties to avoid exclusion from Chapter 69
• Include test reports on thermal conductivity and chemical composition to support classification as 'other' refractory bricks
Related Products under HTS 6902.90.50
Mullite Refractory Brick
Mullite refractory bricks, synthesized from kaolin and fired, used in aluminum smelters for creep resistance at 1600°C+. Excellent for reducing atmospheres. Classed HTS 6902.90.50 other refractories.
Andalusite Refractory Tile
Andalusite refractory tiles fired from andalusite ore for torpedo ladle linings in steel plants, offering thermal shock resistance. HTS 6902.90.50 applies.
Bauxite Refractory Brick
Bauxite-based refractory bricks fired for lime kilns and incinerators. Good load-bearing at high temps. HTS 6902.90.50.
Chamotte Refractory Block
Chamotte (fired clay grog) refractory blocks for general furnace construction. Stable volume, low deformation. HTS 6902.90.50.
Cordierite Refractory Brick
Cordierite bricks for tunnel kilns in ceramics industry, excellent thermal shock resistance. Fired magnesia-alumina-silicate. HTS 6902.90.50.
Magnesia-Chrome Refractory Brick
Magnesia-chrome refractory bricks combine magnesia and chrome ore, fired to create dense blocks for lining steelmaking furnaces and rotary kilns. They offer superior resistance to basic slags and high temperatures. Falls under HTS 6902.90.50 as 'other' refractory ceramic constructional goods, excluding siliceous earths.