3-Mercaptopropanoic Acid from Canada
3-Mercaptopropanoic acid features a three-carbon chain with terminal mercapto and carboxylic acid groups. This separate chemically defined compound qualifies under HTS 2930.90.4920 as a mercaptocarboxylic acid per Chapter 29 scope. Applied in polymer cross-linking and biochemical research.
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
• Certify CAS 107-96-0 and molecular formula C3H6O2S for accurate 2930.90.4920 heading
• Package with stabilizer if required; document per Chapter 29 note 2(f) to maintain pure compound status
• Prevent reclassification to 3824 by limiting solvent to <10% for transport safety