1-Naphthylamine-4,8-disulfonic Acid from Mexico
This disulfonic acid derivative of 1-naphthylamine serves as a key intermediate for acid dyes and azoic coupling components. Classified under HTS 2921.45.90.90 as an 'other' derivative of α-naphthylamine, it retains the primary aromatic amine function despite sulfonic substitutions. The classification follows Chapter 29 rules prioritizing amine-function compounds.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Declare structural formula and confirm naphthylamine backbone via HPLC; multiple sulfonic groups don't change amine classification
• Include safety data showing it's not a finished dye (no coloration function) to prevent Chapter 32 reclassification
• For bulk shipments, ensure stabilizers (if added) comply with Chapter 29 note (f) for transport only