1-Butene (But-1-ene)
1-Butene is a colorless, flammable acyclic unsaturated hydrocarbon with the formula CH2=CH-CH2-CH3, classified under HTS 2901.23.00.00 as a pure isomer of butene. It serves as a key monomer in producing linear low-density polyethylene (LLDPE) and other polymers.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If liquefied petroleum gas mixture containing butene
Butene in LPG mixtures falls under Chapter 27 petroleum gases rather than pure Chapter 29 hydrocarbons.
If containing 50% or more butadienes
Higher diene content shifts classification to other unsaturated hydrocarbons in the same subheading.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify purity levels (>99%) via certificate of analysis to confirm classification as chemically defined compound
• Include Material Safety Data Sheets (MSDS) documenting flammability and handling requirements for customs clearance
• Avoid misclassification as mixtures by ensuring single-isomer specification in import documentation
Related Products under HTS 2901.23.00.00
cis-2-Butene
cis-2-Butene is the cis isomer of 2-butene, an acyclic alkene with formula CH3-CH=CH-CH3, falling under HTS 2901.23.00.00 for butene isomers. It is used in organic synthesis and as a research chemical.
trans-2-Butene
trans-2-Butene, the trans stereoisomer of 2-butene (CH3-CH=CH-CH3), is a separate chemically defined compound under HTS 2901.23.00.00. Commonly used in petrochemical research and isomerization studies.
Isobutene (2-Methylpropene)
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.
1,3-Butadiene (refined isomer)
While primarily under 2901.24, highly purified 1,3-butadiene can be considered a butene-related diene isomer under HTS 2901.23.00.00 when specified as such. Used exclusively for synthetic rubber (SBR) production.
2-Butene Industrial Grade
Industrial 2-butene (mixed cis/trans isomers) is a chemically defined butene mixture under HTS 2901.23.00.00, used in solvent production and alkylation processes.
Butene-1 Polymerization Grade
High-purity butene-1 (>99.5%) specifically for LLDPE copolymer production, classified as pure butene isomer under HTS 2901.23.00.00.