Low Porosity Fireclay Bricks
Low porosity fireclay refractory bricks minimize slag penetration in blast furnace stove checkers through dense vitrified structure from high firing. Balance insulation with strength. Standard classification HTS 6902.90.10.
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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 dense fireclay formulations
Density/porosity affects subheading within aluminous bricks.
If unglazed tiles from same clay body
Tile form (<3.2 cm thick) shifts per US notes.
If clay-based prepared colors
Decorative clay products exclude if not refractory fired.
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Import Tips & Compliance
• Apparent porosity <18% certification required
• Cold crushing strength documentation (>300 kg/cm²)
• Specify reheat linear change test results
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