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.
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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.
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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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