Sodium Salt of 1-Naphthylamine-4-sulfonic Acid from Mexico
The sodium salt form improves water solubility for dye coupling processes. HTS 2921.45.90 includes salts of 1-Naphthylamine derivatives per Chapter 29 note 3(C)(1). Inorganic salt modification doesn't change organic compound heading.
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
• Declare as "sodium 4-amino-1-naphthalenesulfonate" CAS 119-78-8
• Salt forms have different solubility/hazard profiles; match SDS accordingly