Gamma Acid (6-Amino-1-naphthol-3-sulfonic acid salt) from Mexico
Gamma acid salts are covered under the HTS 2922.21.1000 enumeration for 6-Amino-1-naphthol-3-sulfonic acid and its salts. Critical for naphthol AS dye series used in pigment printing. Salt form enhances formulation stability.
Duty Rate — Mexico → United States
15.8%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Distinguish J acid vs Gamma acid via melting point (differential >20°C)
• Iron chelate test confirms purity grade for metal complex dyes
• REACH registration status verification for EU-origin material