Schaeffer's Acid (2-Naphthylamine-6-sulfonic acid) from Japan
Schaeffer's acid is an aminohydroxynaphthalenesulfonic acid used primarily as an intermediate in the production of azo dyes and pharmaceuticals. It features an amino group, hydroxyl group, and sulfonic acid group attached to a naphthalene ring, fitting Chapter 29 note (a) for chemically defined organic compounds. Classified under 2922.21.5000 as 'other' aminohydroxynaphthalenesulfonic acids and their salts.
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
• Provide detailed chemical analysis certificates confirming structure as aminohydroxynaphthalenesulfonic acid to avoid reclassification
• Ensure SDS and purity documentation; common pitfall is mislabeling as simple naphthols (2907) without amino function
• Declare CAS number (92-32-0) on entry for customs verification