Ammonium 12-Tungstophosphate from China
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 — China → United States
30.5%
Rate breakdown
9903.91.0125%Effective with respect to entries on or after September 27, 2024, articles the product of China, as provided for in subdivision (b) of U.S. note 31 to this subchapter
9903.05.860%Universal product exemption (U.S. note 52(b))
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