Direct-Bonded Magnesia Refractory Bricks
Direct-bonded magnesia refractory bricks achieve superior purity through high-temperature firing that creates ceramic bonding between periclase grains. Used in converter mouths and hot metal ladles. HTS 6902.90.10 for advanced bonding technology bricks.
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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 >93% magnesia content
Purity levels trigger specific high-magnesia provisions.
If irregular shapes for ladle impact pads
Special constructional forms beyond standard brick geometry.
If calcined magnesite clinker
Intermediate materials before final brick firing in Chapter 25.
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Import Tips & Compliance
• Microstructure photos prove direct bonding vs. matrix bonding
• High purity (>96% MgO) affects duty valuation tier
• Declare hydration resistance test results
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