Ammonium 12-Tungstophosphate from Mexico
Ammonium 12-tungstophosphate is a heteropolyacid salt (NH4)3PW12O40 used as an industrial catalyst. As a complex tungstate of ammonium, it falls under HTS 2841.80.0010 per notes on complex salts.
Duty Rate — Mexico → United States
5.5%
Rate breakdown
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Provide structural formula confirmation for heteropoly classification
• Register under TSCA if novel catalyst import
• Avoid pitfall of 3824 classification by proving single chemically defined compound