Technical Grade Calcium Tungstate from Canada
Technical grade calcium tungstate granules used as a flux in welding electrodes and metallurgy to stabilize tungsten content. It qualifies for HTS 2841.80.0020 as a salt of peroxometallic acid (tungstate) of calcium. This form provides controlled tungstate release in high-temperature applications.
Duty Rate — Canada → United States
5.5%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Include material safety data sheets specifying tungstate content over 90%; test for heavy metal impurities
• Common pitfall: bulk shipments misdeclared as ores (2613); segregate from other metal salts during storage