2-Naphthylamine-6-sulfonic Acid (Laurent's Acid) from Mexico
Laurent's Acid is a sulfonated derivative of 2-naphthylamine (β-Naphthylamine) used in manufacturing acid dyes and pharmaceuticals. Classified under HTS 2921.45.90 as 'other' aromatic monoamine derivatives; salts thereof in Chapter 29. The retained naphthylamine structure governs classification over sulfonation.
Duty Rate — Mexico → United States
16.5%
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
• CAS 92-43-3 must appear on invoice; distinguish from Tobias acid (2.8-isomer) to ensure correct HTS
• Beta-naphthylamine derivatives require carcinogen handling precautions; include safety data
• Avoid bulk packaging over 25kg without proper stabilization per chapter note (f)