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℃ |
| CAS DataBase Reference | 115-11-7(CAS DataBase Reference) |
| EPA Substance Registry System | Isobutene (115-11-7) |
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 |
| F | 4.5-31 |
| Autoignition Temperature | 869 °F |
| DOT Classification | 2.1 (Flammable gas) |
| HazardClass | 2.1 |
| PackingGroup | III |
| HS Code | 29012330 |
| Hazardous Substances Data | 115-11-7(Hazardous Substances Data) |
| Toxicity | LC50 (inhalation) for mice 415 g/m3/2-h, rats 620 g/m3/4-h (quoted, RTECS, 1985). |
