Silica-Alumina Refractory Brick
Refractory brick with >50% combined silica (SiO2) and alumina, engineered for blast furnace linings. Fired ceramic construction withstands thermal shock and corrosion from molten materials. Falls under 6902.20.10 for high-silica/alumina refractory bricks.
Import Duty Rates by Country of Origin
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 in blocks or tiles form
6902.20.10 specific to bricks; blocks/tiles use 6902.20.20.
If containing carbon or graphite
Carbon-containing refractories classify under Chapter 68, not 69.
If repurposed as lab crucible
End-use as porcelain labware shifts to 6909, per chapter exclusions.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Submit lab test results per ASTM C357 for oxide content to prove >50% Al2O3/SiO2
• Include end-use declaration as refractory to distinguish from common bricks
• Check for proper HS declaration; mixtures must total >50% specified oxides
Related Products under HTS 6902.20.10
High-Alumina Refractory Firebrick
High-alumina refractory firebrick containing over 50% alumina (Al2O3), fired after shaping for high-temperature resistance. Used in furnaces and kilns for lining to withstand extreme heat without deforming. Classifies under 6902.20.10 as refractory bricks with predominant alumina content.
70% Alumina Kiln Brick
Kiln brick composed of 70% alumina for pottery and glass kilns, providing superior refractoriness. Shaped and fired to maintain structural integrity at 1700°C+. HTS 6902.20.10 applies to alumina-dominant refractory bricks.
Blast Furnace Alumina Brick
Heavy-duty alumina brick (>50% Al2O3) for blast furnace hot blast stove checker chambers. Refractory properties resist slag erosion and high thermal loads. Classified in 6902.20.10 as high-alumina refractory brick.
Insulating Alumina Refractory Brick
Lightweight insulating brick with >50% alumina and porous structure for furnace backup insulation. Fired ceramic retains low thermal conductivity at high temps. 6902.20.10 for high-alumina refractory bricks.
Chrome-Alumina Refractory Brick
Direct-bonded chrome-alumina brick (>50% Al2O3 with chromic oxide) for glass furnace regenerator checkers. Exceptional corrosion resistance to glass melts. Classifies 6902.20.10 despite chrome, as alumina primary.
Steel Ladle Alumina Brick
High-purity alumina brick (>60% Al2O3) for steel ladle impact pads and purge plugs. Fired to resist molten steel and slag penetration. 6902.20.10 for steelmaking refractory bricks.