Insulating Refractory Castable
Lightweight castable refractory with vermiculite and alumina for low thermal conductivity furnace backings. Under HTS 3816.00.20.50 as other refractory concretes, serviceable to 1400°C with density <1.2 g/cm³. Reduces energy loss in heat processing equipment.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If vermiculite exfoliated without refractory binders
Expanded minerals alone are Chapter 68, not compositions.
If factory-cast into insulating firebrick shapes
Pre-formed insulators are Chapter 69 articles.
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Import Tips & Compliance
• Thermal conductivity (<0.3 W/mK) data essential for insulating claim
• Vermiculite expansion certs prevent asbestos contamination flags
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