Calcined Witherite for Glassmaking from United States
Calcined natural witherite processed to meet glass industry standards for barium content, used to introduce BaO into glass formulations. This product retains its natural barium carbonate composition, as calcination does not fully decompose it to barium oxide, and it is not excluded by Chapter 25 notes.
Duty Rate — United States → Canada
0%
Import Tips
• Ensure the witherite is not fully decomposed to barium oxide, as that would shift classification to heading 28.16
• Provide a certificate of analysis showing barium carbonate content and calcination temperature to support the tariff classification
• Verify that no anti-dusting agents render it specifically suited for glassmaking beyond general use