o-Naphthionic Acid (1-Amino-2-naphthalenesulfonic Acid) from China
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 — 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
• 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