Fire-Resistant Coated Cork Insulation Disks from Canada
Solid cylindrical disks of compressed cork with intumescent coating for pipe insulation and fire barriers. Classified in HTS 4504.10.20.00 as insulation disks explicitly covered under compressed cork provisions. The coating activates in high heat for added safety.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Provide fire rating certifications (e.g
• ASTM E84) to validate insulation and coating claims
• Declare if disks fit 'solid cylinders including disks' precisely to match the tariff description
• Monitor coating thickness; functional coatings stay in 4504, decorative may shift to Chapter 32 paints