Potassium 4-Sulfobenzoate from Canada
Potassium 4-sulfobenzoate (p-sulfobenzoic acid potassium salt) serves as a reactive intermediate in azo dye coupling and sulfonated drug synthesis. Specifically listed under HTS 2916.39.04.00 among aromatic monocarboxylic acid sulfonated derivatives.
Duty Rate — Canada → United States
10%
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
• Counterion analysis required; sodium salt would classify under 2916.39.2500
• Dust hazard precautions needed; use anti-dusting agent only if per chapter note (g)
• Solubility testing documentation helps distinguish from insoluble sulfonates