Ammonium 1-Naphthol-4-sulfonate from Canada
Ammonium salt of 4-Hydroxy-1-naphthalenesulfonic acid, used in analytical chemistry. Classified in HTS 2908.99.06.00 following Chapter 29 rule for salts of sulfo derivatives.
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
• Declare cation ratio to avoid misclassification as organic base salt
• Use lab-grade labeling for compliance
• Monitor for emetic additions triggering safety note (g)