Ammonium Silicotungstate from Mexico
Ammonium silicotungstate ((NH4)4SiW12O40) used in ion-exchange resins and analytics. As a complex tungstate salt of ammonium, properly classified in HTS 2841.80.0010.
Duty Rate — Mexico → United States
5.5%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Molecular weight confirmation distinguishes from simple tungstates
• Ion-exchange end-use declaration
• Stable solid form simplifies shipping