Thioglycolic Acid (Mercaptoacetic Acid) from Mexico
Thioglycolic acid (HSCH₂COOH), also known as mercaptoacetic acid, is the prototypical organo-sulfur carboxylic acid classified under HTS 2930.90.4950. Features direct sulfur-carbon bonding meeting heading 2930 criteria; excluded from Chapter 32 coloring matters. Widely used in hair permanents, metal polishing, and chemical synthesis.
Duty Rate — Mexico → 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
• Include odorant/emetic documentation if added for safety per Chapter 29(g)
• Certify <0.1% heavy metals content for cosmetic/pharma grade imports
• Segregate 70% aqueous vs pure forms; different documentation requirements