1-Naphthol-3,6-disulfonic acid from Canada
Also known as 1,4-dihydroxy-2,7-naphthalenedisulfonic acid or H-acid in dye chemistry, this compound is explicitly listed under HTS 2908.99.0300. It features a naphthol structure with two sulfo groups, classifying as a sulfonated phenol derivative containing only sulfo groups. Critical intermediate for reactive dyes used in textiles.
Duty Rate — Canada → United States
15.5%
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
• Use trade name 'H-acid' with chemical synonyms on documentation for customs recognition
• Ensure pH stability in transport; acid form requires corrosion-resistant packaging
• Batch testing for isomer purity critical, as chapter note (b) excludes certain isomer mixtures