Silicotungstic Acid Hydrate from Canada
Silicotungstic acid hydrate (H4SiW12O40·xH2O) functions as a catalyst in esterification, under HTS 2841.80.00 for its tungstate core structure. Green acid catalyst.
Duty Rate — Canada → 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
• Keggin structure verification via Raman spectroscopy
• Corrosive strong acid; UN 3260 proper shipping name
• Calcined vs hydrate forms distinguished by TGA