Thermal Mass Concrete Blocks from Mexico
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 — Mexico → United States
13.2%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Certify aggregate types for thermal claims; R-value docs optional
• Ensure uniformity for LEED credits