High-Temp Calcium Silicate Flue Insulation from Canada
Molded cylindrical sections for chimney flues in biomass plants, resisting 1100°F gases via calcium silicate structure. Classified under HTS 6806.90.00.20 for expanded mineral heat insulators.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Certify low chloride content (<50ppm) for corrosion compliance in flue apps
• Declare as pre-molded to prevent bulk mixture duties