2-Mercaptopropionic Acid from Canada
2-Mercaptopropionic acid (HS-CH2-CH2-COOH) is an organo-sulfur carboxylic acid with both mercapto and carboxyl groups on adjacent carbons. Classified under HTS 2930.90.4920 as 'other mercaptocarboxylic acids' per Chapter 29 notes defining organo-sulfur compounds. Used in pharmaceutical intermediates and chelating agents.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.6095.8%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 or GC-MS spectra confirming mercapto position and >95% purity for Chapter 29 classification
• Include SDS with GHS corrosive pictograms; UN 2922 for solid form handling
• Distinguish from thioethers (2930.20) by confirming free -SH via titration analysis