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%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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)