2-Naphthylamine-3,6-disulfonic Acid (R Acid) from United States
R Acid, or 2-naphthylamine-3,6-disulfonic acid, is a disulfonated derivative of 2-naphthylamine, used as an intermediate for direct and reactive dyes in cotton dyeing. It retains the primary amine function and is classified under the tariff item for naphthylamine derivatives. The sulfonic acid groups do not alter its essential character as an amine-function compound.
Duty Rate — United States → Canada
0%
Import Tips
• Verify the product is a separate chemically defined compound under Chapter 29 Note 1(a)
• If the product is a salt, classify it with the parent compound per Note 5(C)(1)
• Provide a certificate of analysis to the CBSA to confirm the chemical structure