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%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• pH <1 in 1% solution certification; light protection required
• Avoid 'sulfanilic acid' misnomer causing aniline derivative confusion under heading 2921