Sodium Tetraphenylboron for Potassium Assay from Mexico
Specialty sodium tetraphenylboron formulated for potassium assay kits in clinical and environmental labs, remains under HTS 2931.90.15.00 as the principal aromatic organo-inorganic compound. Its use as a precipitant aligns with chemically defined status in Chapter 29.
Duty Rate — Mexico → United States
15.8%
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
• Include method validation references in import docs; ensure GMP compliance for lab-grade imports; test for moisture content to maintain efficacy during shipping