p-Toluenesulfonic Acid (PTSA) from Canada
p-Toluenesulfonic acid is a strong organic acid obtained by sulfonation of toluene, fitting the definition of sulfonated aromatic hydrocarbons. It qualifies for HTS 2904.99.40.00 as described in additional U.S. note 3 to section VI, used as a catalyst in esterification and polymerization. The monohydrate form is also common in imports.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.6094.5%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
• Submit certificate of analysis confirming >95% purity to meet 'separate chemically defined compound' requirement
• Declare hydration state (anhydrous vs monohydrate) accurately for correct duty assessment
• Watch for reclassification if mixed with solvents beyond transport allowances per chapter note (e)