Technical Grade Calcium Tungstate from Mexico
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 — Mexico → United States
5.5%
Rate breakdown
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 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