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Chemical Name:
Molecular Formula:
Formula Weight:
MOL File:


Melting point:
−140 °C
Boiling point:
−6.9 °C(lit.)
vapor density 
2 (vs air)
vapor pressure 
3278 mm Hg ( 37.7 °C)
refractive index 
Flash point:
-80 °C
Stable. Highly flammable - readily forms an explosive mixture with air. Incompatible with strong oxidizing agents.
CAS DataBase Reference
115-11-7(CAS DataBase Reference)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  F+
Risk Statements  12
Safety Statements  9-16-33
RIDADR  UN 1055 2.1
WGK Germany  -
RTECS  UD0890000
HazardClass  2.1
PackingGroup  III
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H220 Extremely flammable gas Flammable gases Category 1 Danger P210, P377, P381, P403
H280 Contains gas under pressure; may explode if heated Gases under pressure Compressed gas
Liquefied gas
Dissolved gas
Warning P410+P403
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P377 Leaking gas fire: Do not extinguish, unless leak can be stopped safely.
P381 Eliminate all ignition sources if safe to do so.
P410+P403 Protect from sunlight. Store in a well-ventilated place.

ISOBUTYLENE price More Price(9)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 295469 2-Methylpropene 99% 115-11-7 100g $181 2018-11-13 Buy
Sigma-Aldrich 295469 2-Methylpropene 99% 115-11-7 1kg $510 2018-11-13 Buy
TCI Chemical I0909 Isobutene (ca. 8% in Dichloromethane) 115-11-7 100mL $44 2017-12-01 Buy
TCI Chemical I0909 Isobutene (ca. 8% in Dichloromethane) 115-11-7 500mL $141 2017-12-01 Buy
Sigma-Aldrich 295469 2-Methylpropene 99% 115-11-7 400g $295 2018-11-13 Buy

ISOBUTYLENE Chemical Properties,Uses,Production

Chemical Properties

colourless gas


ChEBI: An alkene that is prop-1-ene substituted by a methyl group at position 2.


Primarily used to produce diisobutylene, trimers, butyl rubber, and other polymers; also to produce antioxidants for foods, packaging, food supplements, and for plastics: Hatch, Pet. Refin. 39, No. 6, 207 (1960).

General Description

ISOBUTYLENE is a colorless gas with a faint petroleum-like odor. For transportation ISOBUTYLENE may be stenched. ISOBUTYLENE is shipped as a liquefied gas under its own vapor pressure. Contact with the liquid can cause frostbite. ISOBUTYLENE is easily ignited. Its vapors are heavier than air and a flame can flash back to the source of leak very easily. The leak can either be a liquid or vapor leak. ISOBUTYLENE can asphyxiate by the displacement of air. Under prolonged exposure to fire or heat the containers may rupture violently and rocket. ISOBUTYLENE is used in the production of isooctane, a high octane aviation gasoline.

Air & Water Reactions

Highly flammable.

Reactivity Profile

ISOBUTYLENE is incompatible with oxidizers. ISOBUTYLENE polymerizes easily. ISOBUTYLENE reacts easily with numerous materials, such as alkyl halides, halogens, concentrated sulfuric acid, hypochlorous acid, aluminum chloride, carbon monoxide and hydrogen with a cobalt catalyst. Polymerization is catalyzed by aluminum chloride and boron trifluoride.

Health Hazard

Inhalation of moderate concentrations causes dizziness, drowsiness, and unconsciousness. Contact with eyes or skin may cause irritation; the liquid may cause frostbite.

Fire Hazard

Behavior in Fire: Containers may explode in fire. Vapor is heavier than air and may travel a long distance to a source of ignition and flash back.

Purification Methods

Dry isobutene by passage through anhydrous CaSO4 at 0o. Purify it further by freeze-pump-thaw cycles and trap-to-trap distillation. [Beilstein 1 IV 796.]

ISOBUTYLENE Preparation Products And Raw materials

Raw materials

Preparation Products


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