Calcined Witherite Lumps from Canada
Witherite ore that has undergone thermal calcination to remove impurities while retaining its natural barium carbonate composition in lump form. Falls under HTS 2511.20.00.00 as calcined natural barium carbonate, explicitly covered in the heading excluding only barium oxide. Primarily used in glass manufacturing and chemical synthesis.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Include calcination process certificates showing temperature controls to prove it remains barium carbonate, not converted to oxide
• Declare exact calcination method and BaCO3 content to comply with statistical reporting requirements
• Watch for misclassification as barium oxide if over-calcined; test samples if challenged by customs