Difenzoquat Methyl Sulfate Ion-Pair Reagent from Mexico
Specialty grade 1,2-dimethyl-3,5-diphenyl-1H-pyrazolium methyl sulfate used as ion-pairing agent in reversed-phase HPLC for quaternary ammonium compound analysis. Meets Chapter 29 note (e) as solvent-dissolved for safe transport but suitable for general lab use. The pyrazole structure classifies specifically under HTS 2933.19.15.00.
Duty Rate — Mexico → United States
10%
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
• Specify concentration and solvent (typically methanol/water) complies with Chapter 29 note (e) transport criteria
• Provide documentation that solution suitable for general analytical use, not proprietary method-specific
• Label clearly as 'HPLC ion-pair reagent' to prevent confusion with pesticide technical material