Phenol-4-Sulfonic Acid from Canada
4-Hydroxybenzenesulfonic acid is the direct sulfonated phenol containing only sulfo groups, used in dye and pharmaceutical intermediates. Precisely fits HTS 2908.99.1500 definition.
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
• pH <1 in 1% solution certification; light protection required
• Avoid 'sulfanilic acid' misnomer causing aniline derivative confusion under heading 2921