Heat-Treated Flint Shingle from Mexico
Heat-treated flint shingle, crushed and screened for use in concrete aggregates or road surfacing, providing silica-rich durability. Specifically listed in HTS 2517.10.00 as shingle and flint suitable for construction aggregates. Thermal processing enhances fracture resistance.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include heat-treatment process documentation and temperature logs for customs verification
• Silica content analysis prevents misclassification as general quartzite (2506.20)