Laurent's Acid (2-Naphthylamine-3,6-disulfonic Acid) from Mexico
Laurent's acid, a di-sulfonic derivative of 2-naphthylamine, functions as a dye coupler in textile coloration chemistry. Covered by HTS 2922.21.4000 as specified in additional U.S. note 3 for import quotas. Despite two sulfonic groups, it remains classified here due to primary amino-hydroxy-naphthalene structure.
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
• Secure end-user certificates demonstrating dye production use to qualify for quota allocations
• Document sulfonic acid content via titration analysis for potential statistical reporting suffixes
• Separate from other naphthylamine sulfonic acids in manifests to prevent quota exhaustion