Insulating Refractory Castable
Lightweight castable with ceramic fiber and vermiculite for low thermal conductivity furnace backings. Under HTS 3816.00.20 as other refractory concretes, used behind dense linings in heat processing. Balances insulation and strength.
Import Duty Rates by Country of Origin
| Origin Country | MFN Rate | Ch.99 Surcharges | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | 3% | +37.5% | 40.5% |
| 🇲🇽Mexico | 3% | +10.0% | 13% |
| 🇨🇦Canada | 3% | +10.0% | 13% |
| 🇩🇪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 fiber-dominated without cementitious binders
Mineral wools/fibers alone in 6806; binders create Chapter 38 mix.
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
• Specify density (<1.5 g/cm³) and K-factor to prove insulating refractory nature
• Fiber content requires OSHA MSDS; watch for asbestos misdeclaration
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