Ammonium Metatungstate from Mexico
Ammonium metatungstate ((NH4)6H2W12O40) is an ammonium salt of a peroxometallic tungstic acid complex, widely used in catalysts and tungsten metal production. Classified under HTS 2841.90.50.00 as 'other' salts of oxo- or peroxometallic acids. It qualifies as chemically defined per Chapter 28/29 notes.
Duty Rate — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide detailed chemical assay confirming metatungstate structure to distinguish from simple tungstates in 2841.80
• Check for REACH compliance if transshipping from EU; pitfall is incorrect declaration as 'tungsten compound' leading to wrong heading
• Use UN-approved packaging for powder form to prevent dust hazards during transport