Insulating Refractory Brick
Lightweight insulating refractory bricks, fired from vermiculite-clay mixes, reduce heat loss in furnace walls and backup linings. Low thermal conductivity with high porosity. HTS 6902.90.50 for other refractory bricks.
Import Duty Rates by Country of Origin
| Origin Country | MFN Rate | Ch.99 Surcharges | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | +37.5% | 37.5% |
| 🇲🇽Mexico | Free | +10.0% | 10% |
| 🇨🇦Canada | Free | +10.0% | 10% |
| 🇩🇪Germany | Free | +10.0% | 10% |
| 🇯🇵Japan | Free | +12.5% | 12.5% |
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 carbon or graphite insulating types
Carbon-based insulators under 6903 carbon provisions.
If slag wool or mineral fiber based
Non-ceramic insulators classify as worked mineral products.
If prefabricated insulating furnace components
Assembled insulating structures under 6906.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide density and thermal specs to prove insulating refractory nature
• Ensure not excluded as Chapter 68 articles if vermiculite dominant
Related Products under HTS 6902.90.50
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.
Andalusite Refractory Tile
Andalusite refractory tiles fired from andalusite ore for torpedo ladle linings in steel plants, offering thermal shock resistance. HTS 6902.90.50 applies.
Bauxite Refractory Brick
Bauxite-based refractory bricks fired for lime kilns and incinerators. Good load-bearing at high temps. HTS 6902.90.50.
Chamotte Refractory Block
Chamotte (fired clay grog) refractory blocks for general furnace construction. Stable volume, low deformation. HTS 6902.90.50.
Cordierite Refractory Brick
Cordierite bricks for tunnel kilns in ceramics industry, excellent thermal shock resistance. Fired magnesia-alumina-silicate. HTS 6902.90.50.
High-Alumina Refractory Firebrick
High-alumina refractory firebricks are ceramic bricks composed primarily of alumina, fired at high temperatures to withstand extreme heat above 1500°C. They are used in furnace linings and kilns for their excellent thermal shock resistance and corrosion resistance. Classified under HTS 6902.90.50 as refractory ceramic constructional goods other than siliceous fossil meals, due to their fired ceramic composition for high-temperature industrial applications.