Section VI — Products of the chemical or allied industries
Chapter 29 — Organic chemicals
Heading 2901 — Acyclic hydrocarbons.
National subdivision 2901.2 — Unsaturated:
Subheading 2901.23 — Butene (butylene) and isomers thereof
HS code
2901.23.00 Butene (butylene) and isomers thereof, unsaturated
Last Verified Date - 1 October 2026
Common commodities
Chemically pure 1-ButenePure unsaturated C4 (But-1-ene)Isobutylene - chemically pureTrans-2-Butene - chemical purity gradeC4H8 But-2-ene (cis or trans) - high purityChemical purity butene isomers mixHigh purity Isobutylene for polymerizationPure C4 unsaturated hydrocarbon (butene isomer)Trans-1,3-Butadiene (excluded due to double bond in different position)Chemically pure butane (excluded as it's saturated)