Heat-Treated River Flint Shingle from United States
Flint pebbles that have been heat-treated to improve weathering resistance, used in concrete aggregates and road metalling. The heat treatment is explicitly allowed by the tariff item description, and the product remains a pebble for aggregate use under 2517.10.00.
Duty Rate — United States → Canada
0%
Import Tips
• Document the heat treatment process to show it does not alter the product's structure beyond what is allowed
• Declare the product as flint shingle for concrete or road use
• Be aware that heat treatment is permitted only if it does not make the product suitable for a specific use other than general aggregate