Diethyl Phosphite
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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing metal impurities exceeding 0.1% directly linked to phosphorus
Becomes organo-inorganic compound under heading 2931 when non-carbon elements like metals are directly bonded.
If supplied as aqueous solution >50% concentration for transport
Chapter 28 covers other phosphites; solutions may shift if not qualifying under Chapter 29 note 2(d).
If imported as mixture with >10% solvents or stabilizers for retail pesticide formulation
Mixtures not qualifying as Chapter 29 pure compounds fall under prepared chemical mixtures in 3824.
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Import Tips & Compliance
• 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
Related Products under HTS 2920.22.00.00
Diethyl Phosphite 98% Technical Grade
Technical grade diethyl phosphite at 98% purity is used in industrial synthesis of herbicides like glyphosate intermediates. It falls under HTS 2920.22.00.00 as a phosphite ester meeting Chapter 29 requirements for chemically defined organic compounds.
Stabilized Diethyl Phosphite with MEHQ Inhibitor
Diethyl phosphite stabilized with 100ppm monomethyl ether hydroquinone (MEHQ) prevents auto-oxidation during storage. Classified under HTS 2920.22.00.00 per Chapter 29 note 2(f) as phosphite ester with necessary preservative.
Diethyl Phosphite for Glyphosate Synthesis
High-purity diethyl phosphite specifically for manufacturing glyphosate herbicide via phosphonate reaction pathway. HTS 2920.22.00.00 classification as chemically defined phosphite ester used in agrochemical production.
Distilled Diethyl Phosphite 99.5% Purity
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.
Diethyl Phosphite Flame Retardant Intermediate
Diethyl phosphite used to synthesize phosphorus-based flame retardants for textiles and plastics. Classified HTS 2920.22.00.00 as phosphite ester essential for organophosphorus polymer additives.
Bulk Diethyl Phosphite in ISO Tanks
Diethyl phosphite shipped in bulk ISO tanks for industrial chemical distribution, classified under HTS 2920.22.00.00 as qualifying transport packaging per Chapter 29 note 2(e).