1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid from Canada
This specific diaminohydroxynaphthalenedisulfonic acid is explicitly listed in HTS 2922.21.1000 and serves as a diazo coupling component in acid dye synthesis. Its structure features both amino (-NH2) and hydroxy (-OH) oxygen functions on the naphthalene ring with sulfonic acid groups. Supplied as technical grade powder (95%+ purity) for chemical manufacturing.
Duty Rate — Canada → United States
15.8%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Batch testing required to verify isomer identity versus other naphthalenedisulfonic acids
• Moisture content analysis prevents weight-based duty disputes on hygroscopic material
• EPA TSCA certification needed for US manufacturing introduction