N-Methyl-N-ethylphosphoramidic difluoride from Canada
A mixed methyl-ethyl N,N-dialkyl phosphoramidic dihalide using fluoride halogens, under HTS 2929.90.50.18. Employed in fluorinated polymer synthesis and as a fluorinating agent. The dihalide nitrogen function places it specifically in this subheading per Chapter 29 definitions.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.6093.5%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
• Specify halide type (F vs Cl) in invoices; difluorides still qualify under dihalides
• Use fluoropolymer-compatible containers to prevent reaction during transport
• Verify no coordination with metals—per note (C)(3), cleaves to organic fragments for classification