1-Naphthylamine-4-sulfonic Acid (Naphthionic Acid) from Mexico
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 — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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