4,4'-Diamino-2,2'-stilbenedisulfonic acid from Canada
This is a specific aromatic polyamine derivative with two amino groups and sulfonic acid groups, classified under HTS 2921.59.2000 as it exactly matches the chemical structure of 4,4'-diamino-2,2'-stilbenedisulfonic acid. It serves as a key intermediate in dye synthesis, particularly for direct dyes used in textile coloring.
Duty Rate — Canada → United States
16.5%
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
• Verify purity and chemical identity via certificate of analysis to confirm classification under 2921.59.2000
• Include Safety Data Sheet (SDS) and ensure proper hazardous material labeling for sulfonic acid compounds
• Avoid misclassification as finished dyes; this is a pure chemical intermediate per Chapter 29 notes