Formula: C4H8

Isobutylene is a colorless, flammable gas.

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Applications of isobutylene include the following:

  • Its main use is in the production of Butyl rubber
  • Used in organic synthesis and in the production of high octane aviation gasoline




Grade 2.0 Grade 2.5
Purity 99% 99.5%
Other Hydrocarbons  < 4500 ppmv
H20  < 3 ppmv
Sulfur  < 1 ppmv

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

Chemical & Physical Properties
Molecular Weight 53.1063
Specific Volume 6.90 cu. ft/lb
Flammability Limits in Air 1.8-9.6%
Pressure @ 70° F 24 psig
Valve Outlet CGA 510


Shipping Information
DOT Name Isobutylene
Hazard Class 2.1
DOT No. UN 1055
DOT Label Flammable Gas
CAS No. 115-11-7


Cylinder Size Fill Weight (lbs)
LP30 120
LP05 24

*This gas not available for purchase online.