Dimethyl Methylphosphonate (DMMP)
Dimethyl methylphosphonate is an organophosphorus compound with the formula CH3P(O)(OCH3)2, containing a phosphorus atom bonded to one methyl group and two methoxy groups with no other carbon atoms directly attached to phosphorus. It falls under HTS 2930.90.9225 as it precisely matches the chemical structure specified for phosphorus compounds with one methyl group. Commonly used as a flame retardant and chemical intermediate.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing other heteroatoms like sulfur directly linked to carbon
Compounds with organo-sulfur linkages shift to heading 2931 per chapter note on organo-inorganic compounds.
If classified primarily as alkyl phosphate ester without specific methylphosphonate structure
Broader phosphate esters fall under Chapter 29 heading 2909; specific structure determines 2930 placement.
If when imported as finished finishing agent rather than pure chemical
Formulations for textile finishing are classified by end use in Chapter 38, not as pure organic compounds.
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Import Tips & Compliance
• Provide detailed chemical analysis certificates (CAS# 756-79-6) confirming the exact molecular structure to verify classification under 2930.90.9225
• Ensure SDS includes phosphorus bonding structure; misclassification as general organophosphorus (2931.00) is common without proof
• Declare purity levels accurately as impurities may trigger reclassification if exceeding chapter note tolerances
Related Products under HTS 2930.90.92.25
Ethyl Methylphosphonic Acid (EMPA)
Ethyl methylphosphonic acid (CH3P(O)(OH)(OC2H5)) is a hydrolysis product of nerve agents, featuring phosphorus bonded to one methyl group and one ethyl group with no additional carbon atoms. Classified under HTS 2930.90.9225 due to its specific phosphorus substitution pattern matching the heading description. Used in chemical analysis and degradation studies.
Methylphosphonic Dichloride
Methylphosphonic dichloride (CH3P(O)Cl2) contains phosphorus bonded solely to one methyl group and two chlorine atoms, fitting HTS 2930.90.9225's criteria for phosphorus compounds with specified alkyl groups. This reactive intermediate is used in organophosphorus synthesis. No other carbon atoms are present in the core structure.
Isopropyl Methylphosphonic Acid
Isopropyl methylphosphonic acid features phosphorus bonded to one methyl and one isopropyl group, precisely matching HTS 2930.90.9225's structural requirement. Used as a metabolite marker in pesticide and chemical weapons monitoring. The limited carbon attachment ensures chapter 29 classification.
n-Propyl Methylphosphonate
This compound has phosphorus attached to one methyl group and one n-propyl group, fitting HTS 2930.90.9225's narrow definition. Serves as a specialty solvent and reaction intermediate in pharmaceutical synthesis. Structure confirmed by P-NMR spectroscopy.