2-Naphthylamine-6-sulfonic Acid (Schaeffer's Acid) from Japan
Schaeffer's acid, or 2-naphthylamine-6-sulfonic acid, is an aromatic amine-sulfonic acid used as a diazo component in dye manufacturing. It is explicitly named in HTS 2921.45.25.00 as a derivative of 2-naphthylamine (β-naphthylamine) with sulfonic functionality. This fits Chapter 29's scope for chemically defined amine-function compounds.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include HPLC chromatograms verifying single isomer content to distinguish from 2921.45.25 mixtures
• Label with GHS corrosive pictograms and ensure DOT-compliant packaging for sulfonic acids
• Avoid bulk shipments without stabilizers; anticaking agents permitted per Chapter note (f)