Sodium Tetraphenylboron for Potassium Assay from China
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 — China → United States
18.3%
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
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