4-Amino-1-naphthalenesulfonic acid, sodium salt (Naphthionic acid sodium salt) from Japan
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 — Japan → United States
15.8%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
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