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6806.20.00.00/Expanded Clay Geothermal Fill/Canada

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%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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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