Insulating Refractory Castable from Mexico
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.
Duty Rate — Mexico → United States
13%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Specify density (<1.5 g/cm³) and K-factor to prove insulating refractory nature
• Fiber content requires OSHA MSDS; watch for asbestos misdeclaration