Gamma Acid Azo Coupler from Canada
Gamma Acid (2-amino-8-naphthol-3,6-disulfonic acid) couples with diazonium salts to form fast dyes for wool and silk. Classified in HTS 2927.00.40.00 per additional U.S. note 3 for essential azo dye components. Qualifies under chapter notes for chemically defined compounds used in dye synthesis.
Duty Rate — Canada → United States
110%
Rate breakdown
9903.04.6093.5%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
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 CAS number (92-88-6 variant) and purity >95% to match regulatory listings
• Include wastewater treatment plan info if required for dye intermediate permits
• Store below 5°C during transit; thermal instability affects chapter note compliance