4-Amino-1-naphthalenesulfonic acid, sodium salt (Naphthionic acid sodium salt) from Canada
Naphthionic acid sodium salt, chemically 4-amino-1-naphthalenesulfonic acid sodium salt, serves as a diazo component in dye chemistry. It matches HTS 2921.45.20.00 explicitly as a named aromatic monoamine derivative and salt thereof. Supplied as a soluble powder for coupling reactions in pigment production.
Duty Rate — Canada → United States
15.8%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Certify sodium salt form with ionic content analysis; free acid form might classify differently under amine headings
• Declare as 'not for retail sale' to prevent shift to Chapter 32 exclusions for coloring matter preparations
• Monitor purity thresholds; impurities over 5% may trigger mixture classification under heading 3824