Isobutylene from Japan
Isobutylene (2-methylpropene, C4H8) is a branched unsaturated hydrocarbon from petroleum refinery C4 streams. HTS 2901.29.1050 applies as 'other' petroleum-derived acyclic unsaturated hydrocarbon, separated via extractive distillation. Primary use in butyl rubber and methacrylate production.
Duty Rate — Japan → United States
10%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Typically imported refrigerated (-7°C) or as 55% aqueous solution; specify physical form
• UN1055, Hazard Class 2.1; ensure proper cylinder valve protection for refrigerated liquid
• Avoid confusion with 1-butene; CAS 75-28-5 and branched structure confirmation required