Calcareous Tuff Blocks from Canada
Calcareous tuff, a volcanic calcareous stone, roughly cut into rectangular blocks for monumental sculptures and construction. Meets density criteria for heading 2515 with specific gravity 2.5+. HTS 2515.20.00.00 applies to this other calcareous building stone.
Duty Rate — Canada → United States
13%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Geological assay required to confirm calcareous (not siliceous) composition
• Label with quarry origin to trace for quality disputes or recalls
• Test for acid solubility; high-calcium content validates 2515 classification