1-Naphthylamine-4-sulfonic Acid (Naphthionic Acid) from Canada
Naphthionic acid is an aminohydroxynaphthalenesulfonic acid derivative used in azo dye synthesis and pharmaceutical intermediates. Its structure includes amino and sulfonic acid groups on naphthalene with oxygen-function characteristics. Classified in 2922.21.5000 as other such compounds.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Submit CoA with assay >98% purity to confirm chemically defined status per Chapter notes
• Label as 'not for retail sale' to prevent Chapter 32 reclassification