Ammonium Paratungstate from Mexico
Ammonium paratungstate (APT) is a white crystalline powder with the formula (NH4)10[H2W12O42]·4H2O, used primarily as an intermediate in tungsten metal production. It falls under HTS 2841.80.0010 as it is a tungstate salt of ammonium, specifically a peroxometallic acid derivative classified in this subheading for ammonium tungstates.
Duty Rate — Mexico → 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
• Verify purity and chemical composition via lab analysis to confirm classification as chemically defined ammonium tungstate
• Include Safety Data Sheets (SDS) and Certificates of Analysis in documentation to avoid customs delays
• Ensure proper hazardous material labeling if shipped in powder form to comply with DOT regulations