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%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Include heat-treatment process documentation and temperature logs for customs verification
• Silica content analysis prevents misclassification as general quartzite (2506.20)