Ethyl Methylphosphonic Acid (EMPA) from Canada
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.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.6096.3%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Submit NMR spectra confirming P-CH3 and P-OC2H5 bonds; critical for avoiding misclassification as general phosphonic acids
• Comply with Chemical Weapons Convention import notifications; subject to enhanced scrutiny and end-use certificates
• Label as research chemical only; commercial formulations may shift to pesticide classifications