Diethyl Ethylphosphonate
Diethyl ethylphosphonate (DEEP) is a non-halogenated organo-phosphorus compound used primarily as a chemical intermediate in organic synthesis and flame retardant production. It falls under HTS 2931.43.00.00 as it is specifically named as a separate chemically defined organo-inorganic compound containing phosphorus directly linked to carbon. This colorless liquid is essential in manufacturing pesticides and plasticizers.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing trace halogen impurities exceeding classification thresholds
Halogenated organo-phosphorus derivatives fall under other 2931 subheadings rather than the specific non-halogenated diethyl ethylphosphonate provision.
If classified primarily by sulfur functionality instead of phosphorus
Chapter notes prioritize classification by the principal characteristic group; organo-sulfur compounds precede organo-inorganic in numerical order.
If imported as a mixture with solvents or stabilizers exceeding Chapter 29 purity limits
Solutions or mixtures not qualifying under Chapter 29 note (e) for transport purposes fall into prepared chemical mixtures of 3824.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide detailed chemical analysis certificates confirming purity and structure to verify classification under 2931.43 as a specific organo-phosphorus compound
• Include Safety Data Sheets (SDS) and ensure proper UN packaging for flammable liquids (Class 3) to comply with DOT and customs requirements
• Avoid misclassification as pesticide preparations (3808) by importing as pure compound, not formulated product
Related Products under HTS 2931.43.00.00
Diethyl Ethylphosphonate 98% Technical Grade
Technical grade diethyl ethylphosphonate at 98% purity is used in industrial synthesis of organophosphorus compounds and as a flame retardant additive precursor. Classified under HTS 2931.43.00.00 as the specific non-halogenated organo-phosphorus derivative, even with minor impurities allowed per Chapter 29 notes. Supplied in industrial drums for chemical manufacturing.
DEEP Stabilized with 0.1% Antioxidant
Diethyl ethylphosphonate stabilized with 0.1% antioxidant for transport and storage stability, qualifying under Chapter 29 note (f) for added stabilizers. Specifically classified in HTS 2931.43.00.00 as the named organo-phosphorus compound with necessary preservation additive. Used in pesticide intermediate production.
Diethyl Ethylphosphonate in 10% Ethanol Solution
10% diethyl ethylphosphonate in ethanol solution for safe transport, qualifying under Chapter 29 note (e) as normal packaging method for safety. Classified under HTS 2931.43.00.00 as the specific compound dissolved in solvent not rendering it for specific use. Used in laboratory and fine chemical synthesis.
High Purity Diethyl Ethylphosphonate 99.5%+
Ultra-high purity diethyl ethylphosphonate (99.5%+) for pharmaceutical intermediate and specialty chemical synthesis. Falls under HTS 2931.43.00.00 as the specifically named non-halogenated organo-phosphorus compound per Chapter 29 definitions. Supplied in glass bottles for research applications.