Silicotungstic Acid Hydrate from Germany
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 — Germany → 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
• Keggin structure verification via Raman spectroscopy
• Corrosive strong acid; UN 3260 proper shipping name
• Calcined vs hydrate forms distinguished by TGA