Diethyl Phosphite from China
Diethyl phosphite is a colorless liquid organophosphorus compound with the formula (C2H5O)2P(O)H, classified under HTS 2920.22.00.00 as a phosphite ester of an inorganic acid of nonmetal (phosphorous acid). It serves as a key reagent in organic synthesis for producing phosphonate derivatives and flame retardants.
Duty Rate — China → United States
16.2%
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
• Provide Safety Data Sheet (SDS) and purity certificate confirming >98% diethyl phosphite content to avoid reclassification
• Declare exact CAS number (762-04-9) and ensure proper UN 2845 hazardous material shipping documentation
• Verify inhibitor-free formulations; stabilized versions may require note 2(f) justification under Chapter 29