2901.23.00.00/Isobutene (2-Methylpropene)/Japan

Isobutene (2-Methylpropene) from Japan

Isobutene, or 2-methylpropene (CH2=C(CH3)2), is a branched butene isomer classified under HTS 2901.23.00.00 as an acyclic unsaturated hydrocarbon. Primary use is in manufacturing methyl tert-butyl ether (MTBE) and polyisobutylene.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

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Import Tips

• Include polymerization inhibitor specification to maintain classification as pure compound

• Comply with EPA VOC emission regulations for import documentation

• Separate from butadiene mixtures to avoid 2901.29 classification