Ammonium Metatungstate from Canada
Ammonium metatungstate (AMT) is a soluble powder (NH4)6[H2W12O40]·xH2O used in catalysts, fire-retardant treatments, and plating solutions. Classified under HTS 2841.80.0010 as an ammonium salt of tungstic acid, fitting the peroxometallic salts category.
Duty Rate — Canada → United States
5.5%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Provide detailed assay reports showing metatungstate content to distinguish from paratungstate forms
• Check for REACH/ TSCA pre-registration if destined for chemical manufacturing
• Package in moisture-proof containers to prevent hydration changes affecting classification