1-Naphthylamine-4,8-disulfonic Acid (C Acid) from Canada
C Acid is a disulfonated derivative of 1-naphthylamine used extensively in azo dye synthesis for textiles and leather. It falls under HTS 2921.45.90 as an 'other' derivative of 1-Naphthylamine per Chapter 29 amine-function compounds. The naphthalene ring with amino group maintains its primary classification.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include IUPAC name and CAS (94-70-2) on documentation; declare as dye intermediate to avoid Chapter 32 misclassification
• Ensure packaging meets UN standards for corrosive solids; common issue is inadequate hazard labeling
• Provide end-use certificate if importing for dye manufacturing to facilitate CBP review