Laurent's Acid (2-Naphthylamine-3,6-disulfonic Acid) from Germany
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 — Germany → United States
10%
Rate breakdown
9903.05.3910%Section 301 (forced labor) — European Union member state (col1 rate < 10 percent): MFN < 10% → total duty capped at 10%
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