o-Naphthionic Acid (1-Amino-2-naphthalenesulfonic Acid) from Mexico
o-Naphthionic acid is a chemically defined aromatic monoamine derivative with a sulfonic acid group, used primarily as an intermediate in azo dye synthesis. It falls under HTS 2921.45.25.00 as it is specifically listed as 1-amino-2-naphthalenesulfonic acid within the subheading for naphthylamine derivatives and their salts. This compound meets Chapter 29 note (a) for separate chemically defined organic compounds.
Duty Rate — Mexico → United States
10%
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
• Provide Certificates of Analysis (CoA) confirming chemical identity and purity to avoid misclassification as mixtures
• Ensure SDS and proper UN packaging for Hazard Class 8 (corrosive) during transport
• Verify isomer-specific assays as mixtures of similar acids may trigger different statistical suffixes