1-Naphthylamine-4,8-disulfonic Acid (C Acid) from Japan
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 — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
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