3,6-Dihydroxy-2,7-naphthalenedisulfonic acid sodium salt from Mexico
The sodium salt form of this specific naphthalenedisulfonic acid, directly listed under HTS 2908.99.0300 for sulfonated phenol derivatives containing only sulfo groups. As a salt of an organic sulfo acid, it classifies with the parent acid per chapter note 3(C)(1). Commonly used in textile dye manufacturing.
Duty Rate — Mexico → United States
15.5%
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
• Include assay certificate showing sodium content and confirming salt formation with the organic acid base
• Ensure packaging prevents moisture absorption, as deliquescent salts may require special declarations
• Label with GHS hazard pictograms and UN number if applicable for dangerous goods transport