4-Sulfobenzophenone from Canada
4-Sulfobenzophenone features sulfonic acid group substitution, classifying as sulfonated aromatic ketone derivative per HTS 2914.79.40.00. Applied in water-soluble photoinitiators.
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
• Specify free acid vs. sodium salt form; salts follow chapter note 3(C)
• Hygroscopic; package with silica gel desiccants
• Water solubility testing documentation aids aqueous solution declarations