Tetrabutylammonium Bromide (TBAB) from Mexico
Tetrabutylammonium bromide is a phase-transfer catalyst and ionic liquid precursor used in organic synthesis. This quaternary ammonium salt is classified under HTS 2923.90.0100 as a chemically defined organic compound with the characteristic quat structure. Chapter notes prioritize the last numerical heading for such salts.
Duty Rate — Mexico → United States
16.2%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Supply Certificate of Analysis (COA) confirming >98% purity for lab chemical status
• Small quantities for R&D may qualify for duty relief under HTS provisions
• Prevent misclassification by specifying non-mixture status