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.
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 containing siliceous components beyond clay
Silica-influenced refractories have separate tracking subheadings.
If fibrous ceramic insulation rather than brick form
Glass fiber ceramic products exclude from Chapter 69 per notes.
If pre-formed shapes for specific furnace zones
Specialty refractory shapes shift from standard bricks.
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Import Tips & Compliance
• Measure and declare bulk density (<0.8 g/cm³ typical) to confirm insulating classification
• Avoid moisture exposure pre-import; provide dry storage certificates
• Distinguish from dense bricks via thermal conductivity test data
Related Products under HTS 6902.90.10
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