Expanded Clay Geothermal Fill from Germany
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 — Germany → United States
10%
Rate breakdown
9903.05.3910%Section 301 (forced labor) — European Union member state (col1 rate < 10 percent): MFN < 10% → total duty capped at 10%
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