Formula: C4H8

Trans-2-Butene is an acyclic alkene with four carbon atoms. It is the simplest alkene exhibiting cis/trans-isomerism (also known as (E/Z)-isomerism); that is, it exists as two geometric isomers cis-2-butene ((Z)-2-butene) and trans-2-butene ((E)-2-butene).

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Trans-2-Butene is a petrochemical, produced by the catalytic cracking of crude oil or the dimerization of ethylene. Its main uses are in the production of gasoline (petrol) and butadiene, although some 2-butene is also used to produce the solvent butanone via hydration to 2-butanol followed by oxidation.

Grade 2
Purity 99.0%
Other Hydrocarbons < 1%
Sulfur < 1 ppmv
Moisture < 5 ppmv
Total Impurities < 1%

**Moisture level guaranteed only when Electronic Fluorocarbons prepares the cylinders.
All concentrations are on a mol/mol basis unless otherwise stated.
This product is analyzed liquid phase.
Product sold on the basis of total impurities. Individual impurities may vary slightly.

Chemical & Physical Properties
Molecular Weight 56.11
Specific Volume 7.6 cu. ft/lb
Pressure @ 70° F 15 psig
Flammability Limits 1.6 – 9.7% in Air
Valve Outlet CGA 510
LB CGA 170


Shipping Information
DOT Name Butylene
Hazard Class 2.1
DOT No. UN 1012
DOT Label Flammable Gas
CAS No. 624-64-6



Cylinder Size Fill Weight (lbs)
1/2 ton 540
LP30 128
LP15 77
LP05 25
LP01 6
49L/Size 300 55
44L/Size 200 50
16L/Size 80 18
7L/Size 35 8

*This gas not available for purchase online.