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6810.11.00.70/Thermal Mass Concrete Blocks/Japan

Thermal Mass Concrete Blocks from Japan

Dense concrete blocks designed to store and release heat for passive solar buildings. Classified HTS 6810.11.00.70 as unreinforced artificial stone building blocks. High thermal capacity from specific aggregates.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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Import Tips

• Certify aggregate types for thermal claims; R-value docs optional

• Ensure uniformity for LEED credits

Thermal Mass Concrete Blocks from Japan — Import Duty Rate | HTS 6810.11.00.70