Isobutylene from Mexico
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 — Mexico → United States
10%
Rate breakdown
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 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