Difenzoquat Methyl Sulfate Ion-Pair Reagent from China
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 — China → United States
37.5%
Rate breakdown
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
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