Ammonium Tungstate Powder 99% Pure from Canada
High-purity ammonium tungstate powder (99% assay) serves as a source for tungsten compounds in X-ray screens and phosphors. It is an ammonium salt of wolframic acid, directly matching HTS 2841.80.0010 for ammonium tungstates.
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
• Request supplier COA confirming >98% tungstate content to meet 'chemically defined' criteria
• Declare exact CAS number (e.g
• 11120-25-5 for para form) on commercial invoice
• Avoid common pitfall of classifying as 'mineral product'—insist on chemical compound status