Magnesia Chrome Refractory Bricks
Magnesia chrome refractory bricks combine magnesium oxide and chromite for extreme resistance to basic slags in steelmaking furnaces. These fired ceramic bricks maintain structural integrity at temperatures up to 2000°C. HTS 6902.90.10 covers such 'other' refractory bricks excluding siliceous types.
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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 by weight >50% free magnesia
Specific magnesia-dominant compositions have dedicated subheadings in 6902.
If supplied as unfired shapes or ramming mixes
Unfired refractory materials classify under Chapter 38 as prepared binders.
If for industrial furnace construction as blocks
Larger refractory blocks vs. standard bricks may fall under 6903 other constructional goods.
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Import Tips & Compliance
• Provide mill test reports showing magnesia content and firing certification for customs clearance
• Check for hexavalent chromium restrictions under environmental regulations before import
• Avoid classifying as parts if imported with furnace assemblies to prevent Chapter 84 shifts
Related Products under HTS 6902.90.10
Insulating Firebrick (IFB) 26 Grade
IFB 26 grade insulating firebricks feature low thermal conductivity due to high porosity, fired from clay-kaolin mixes for backup furnace insulation. Service limit around 1430°C makes them ideal for energy-efficient linings. HTS 6902.90.10 applies to these lightweight refractory bricks.
Chrome-Magnesite Refractory Bricks
Chrome-magnesite refractory bricks blend chrome ore with dead-burned magnesite, fired for superior resistance to ferrous slags in electric arc furnaces. They offer balanced properties for steel ladle linings. Covered by HTS 6902.90.10 for composite refractory bricks.
Andalusite Refractory Bricks
Andalusite refractory bricks incorporate mullite-forming andalusite for excellent thermal shock resistance in coke ovens and reheat furnaces. Fired ceramic structure ensures dimensional stability. HTS 6902.90.10 captures these non-siliceous specialty bricks.
90% Alumina Refractory Bricks
90% alumina refractory bricks deliver premium purity for critical zones in aluminum smelters and cement kilns, resisting molten metal and alkali corrosion. High fired density ensures longevity. Standard 'other' classification under HTS 6902.90.10.
Silimanite Refractory Bricks
Silimanite refractory bricks use high-alumina sillimanite minerals for creep-resistant performance in glass tank regenerator checkers. Their fired structure handles 1600°C+ with minimal deformation. HTS 6902.90.10 for these aluminosilicate bricks.
Bauxite-Based Refractory Bricks
Bauxite-based refractory bricks from calcined bauxite aggregate provide economical high-duty performance for rotary cement kilns. Fired to develop spinel bonding for slag penetration resistance. Classed under HTS 6902.90.10 'other' bricks.