Calcium Tungstate Powder from Mexico
Calcium tungstate (CaWO4) powder is a tungstate salt used in fluorescent materials and X-ray screens, under HTS 2841.80.0050 for other tungstates. It qualifies as a chemically defined inorganic compound per Chapter notes.
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
• Certify particle size and purity to rule out optical element classification
• Declare radioactivity if artificially doped, shifting to 2844
• Avoid bulk packaging confusion with 2849 carbides