Distilled Diethyl Phosphite 99.5% Purity from Mexico
Vacuum-distilled diethyl phosphite achieving 99.5% purity for pharmaceutical phosphonate intermediate synthesis. Falls under HTS 2920.22.00.00 as high-purity phosphite ester per Chapter 29 chemical definition.
Duty Rate — Mexico → United States
13.7%
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
• Submit HPLC chromatogram showing single peak >99.5% to confirm chemically defined status
• Pharma imports need DMF reference or equivalent; common rejection for missing impurity profile
• Temperature-controlled shipping mandatory (maintain <15°C) to preserve purity