3-Amino-2,7-naphthalenedisulfonic acid (H-acid) from Japan
H-acid, or 3-amino-2,7-naphthalenedisulfonic acid, is a disulfonated naphthylamine derivative critical for reactive dye synthesis. It is specifically listed under HTS 2921.45.20.00 as an aromatic amine derivative with multiple sulfonic groups. The compound is a brownish powder used in high-performance textile dyes.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Submit chromatograms proving disulfonic structure to distinguish from mono-sulfonic analogs in the same HTS
• Package in moisture-proof containers; hygroscopic nature requires specific declaration for stability claims
• Avoid anti-dusting agents that impart color, as per note 1(g), to maintain pure chemical classification