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
5.5%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
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)