Expanded Clay Geothermal Fill from Canada
Expanded clay aggregate used as backfill around geothermal heat exchanger loops for thermal conductivity. HTS 6806.20.00.00 classification for expanded mineral materials in energy applications. Prevents loop settling.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include thermal conductivity specs (1.5-2.0 W/mK typical)
• Declare borehole backfill end-use for customs context
• High moisture tolerance certification for underground applications