2-Naphthylamine-6-sulfonic Acid (Schaeffer's Acid) from China
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 — China → United States
35%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
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)