Calcium Tungstate Powder from China
Pure calcium tungstate (CaWO4) powder, a chemically defined salt of tungstic acid, used in the production of phosphors for fluorescent lamps and X-ray screens. It falls under HTS 2841.80.0020 as a tungstate of calcium. This inorganic compound is essential for luminescent applications due to its scintillation properties.
Duty Rate — China → United States
30.5%
Rate breakdown
9903.91.0125%Effective with respect to entries on or after September 27, 2024, articles the product of China, as provided for in subdivision (b) of U.S. note 31 to this subchapter
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
• Verify purity and chemical composition with lab certificates to confirm classification as chemically defined tungstate; ensure SDS includes CAS number 7790-75-6
• Watch for contamination that could shift to 2841.90; declare exact calcium content to avoid reclassification