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Isobutylene is a colorless, flammable gas.

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Formula: C4H8

Isobutylene is used in the production of a variety of products. It is alkylated with butane to produce isooctane or dimerized to disobutylene (DIB) and then hydrogenated to make isooctane, a fuel additive.

Isobutylene is also used in the production of methacrolein. Polymerization of isobutylene produces butyl rubber (polyisobutylene or PIB). The most important application of butyl rubber is the manufacture of tires for cars and other vehicles. Other applications of butyl rubber, polybutene and polyisobutylene are lubricants (motor oils), adhesives, sealants and coatings. Isobutylene is also used for the production of anti-oxidants, fragrances and gas odorized products.



Further Specifications

Cylinder Sizes

  • Isobutene is more versatile than hydrogen, making it perfect for jet fuels and gasoline additives.
  • It can be used for production of methacrolein
  • Can be used for making butylated hydroxytoluene, which is an antioxidant product used in food additives
Grade 2.0 Grade 2.5
Purity 99% 99.5%
Other Hydrocarbons < 4500 ppmv
H2O < 3 ppmv
Sulfur < 1 ppmv
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 (lb)
LP30 120
LP05 24

**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.

*This gas not available for purchase online.