Sodium Salt of 1-Amino-8-naphthol-3,6-disulfonic Acid (H Acid) from Canada
H Acid sodium salt is a critical coupling component for reactive dyes, featuring amino-hydroxy-disulfonic functions on naphthalene. It meets Chapter 29 criteria for chemically defined amino-oxygen compounds and their salts. Positioned in 2922.21.5000 as 'other' aminohydroxynaphthalenesulfonic acids.
Duty Rate — Canada → United States
16.5%
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 exact salt form and water content; discrepancies lead to duty disputes
• Use HTSUS advisory rulings for multi-sulfonic derivatives to preempt CBP challenges
• Avoid packaging resembling retail dye forms (Chapter 32 exclusion)