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.
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 sintered synthetic alumina-mullite
High alumina mullite qualifies under alumina subheading.
If technical ceramic crucibles
Lab vessels from mullite under porcelain technical ware.
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Import Tips & Compliance
• Chemical analysis must show mullite phase formation post-firing
• Declare for metallurgical end-use to avoid lab ware confusion
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