Mixed Naphthylamine Sulfonic Acids for Dye Synthesis from Canada
This commercial mixture contains 5- and 8-amino-2-naphthalenesulfonic acid isomers as explicitly described in HTS 2921.45.25.00. Used in multi-component dye formulations, it qualifies as an amine-function compound mixture under Chapter 29 note (b) for isomers. The specific naming governs over general provisions.
Duty Rate — Canada → United States
10%
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 quantitative HPLC analysis showing isomer ratios for customs verification
• Use anti-dusting agents only if needed for safety per Chapter note (g); excess disqualifies
• Declare as 'dye intermediate mixture' not 'technical grade' to maintain Chapter 29 status