7-Amino-1,3,6-naphthalenetrisulfonic acid (R-acid) from Canada
R-acid, chemically 7-amino-1,3,6-naphthalenetrisulfonic acid, is a trisulfonated naphthylamine for direct dyes. Listed under HTS 2921.45.20.00 for its aromatic amine-sulfonic structure per Chapter 29 definitions. Typically a soluble salt form for aqueous dye processing.
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
• Provide sulfonic group count via titration data to confirm trisulfonic identity versus di- or mono-
• Use child-resistant packaging if emetic added per note 1(g); declare safety additives explicitly
• For bulk imports, ensure no retail packing to avoid Chapter 32 exclusions