Home Categories Organic Chemistry Isobutene (ca. 8% in Dichloromethane)
T9261930

Isobutene (ca. 8% in Dichloromethane) , 115-11-7

Synonym(s):
Isobutylene

CAS NO.:115-11-7

Empirical Formula: C4H8

Molecular Weight: 56.11

MDL number: MFCD00008898

EINECS: 204-066-3

Update time: 2022-07-08

PRODUCT Properties

Melting point: −140 °C
Boiling point: −6.9 °C(lit.)
Density  0.5879
vapor density  2 (vs air)
vapor pressure  3278 mm Hg ( 37.7 °C)
refractive index  1.3811
Flash point: -80 °C
form  clear liquid
color  Colorless to Almost colorless
Odor Threshold 10ppm
Water Solubility  263mg/L(25 ºC)
FreezingPoint  -140.34℃
Merck  14,5141
BRN  773645
Henry's Law Constant 0.20, 0.26, 0.33, and 0.41 at 30, 40, 50, and 60 °C, respectively (Leung et al., 1987:Zhang et al., 2002)
Stability: Stable. Highly flammable - readily forms an explosive mixture with air. Incompatible with strong oxidizing agents.
InChIKey VQTUBCCKSQIDNK-UHFFFAOYSA-N
LogP 2.35 at 20℃

Description and Uses

Isobutylene is used as a monomer for the production of various polymers such as butyl rubber, polybutene and polyisobutylene. The most important application of butyl rubber is the manufacture of tyres for cars and other vehicles. Other applications of butyl rubber, polybutene and poyisobutylene are lubricants (motor oils), adhesives, sealants and coatings. Another major use of isobutylene is the production of methyl-tert-butyl ether (MTBE) and ethy-tert-butyl ether (ETBE) which are gasoline blending components for cleaner burning fuels. Isobutylene is also used for the production of anti-oxidants, fragrances and gas odorization products.

Safety

Symbol(GHS) 
GHS02,GHS04
Signal word  Danger
Hazard statements  H220-H280
Precautionary statements  P210-P410+P403
Hazard Codes  F+
Risk Statements  12
Safety Statements  9-16-33
RIDADR  UN 1055 2.1
WGK Germany  -
RTECS  UD0890000
4.5-31
Autoignition Temperature 869 °F
DOT Classification 2.1 (Flammable gas)
HazardClass  2.1
PackingGroup  III
HS Code  29012330
Toxicity LC50 (inhalation) for mice 415 g/m3/2-h, rats 620 g/m3/4-h (quoted, RTECS, 1985).

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