Liquefied Isobutylene (2-Methylpropene) from Mexico
Liquefied isobutylene, an unsaturated C4 olefin used in methyl methacrylate and butyl rubber production. Covered by HTS 2711.14.00 as liquefied butylene (including branched isomers).
Duty Rate — Mexico → United States
0%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Document isobutylene >95% via mass spectrometry to distinguish from isobutane
• Ship in dedicated C4 olefin spheres with polymerization inhibitors