Dinonylnaphthalene Sulfonic Acid from Canada
Dinonylnaphthalene sulfonic acid serves as extractant in hydrometallurgy and lube oil additives. Sulfonated phenolic derivative containing only sulfo groups, classified HTS 2908.99.1500 when >90% pure.
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
• Acid number 95-105 mg KOH/g specification; stable >6 months certification
• Pitfall: Solvent-dissolved forms (50% in kerosene) reclassified to Chapter 38