A8511532
2-Methylbutane , Chromatography, ≥99.5% , 78-78-4
Synonym(s):
2-Methylbutane;Isopentane;iso-Pentane, Isopentane
CAS NO.：78-78-4
Empirical Formula: C5H12
Molecular Weight: 72.15
MDL number: MFCD00009338
EINECS: 201-142-8
Update time: 2022-07-08
PRODUCT Properties
| Melting point: | -160 °C |
| Boiling point: | 30 °C(lit.) |
| Density | 0.62 g/mL at 25 °C(lit.) |
| vapor density | 2.6 (vs air) |
| vapor pressure | 11.17 psi ( 20 °C) |
| refractive index | n |
| Flash point: | −51 °C |
| storage temp. | 2-8°C |
| solubility | 0.048g/l |
| form | Liquid |
| pka | >14 (Schwarzenbach et al., 1993) |
| color | Clear colorless |
| Odor | gasoline-like odor |
| explosive limit | 1.3-7.6%(V) |
| Odor Threshold | 1.3ppm |
| Water Solubility | Miscible with water, hydrocarbons, oils, alcohol and ether. |
| λmax | λ: 192 nm Amax: 1.00 λ: 210 nm Amax: 0.30 λ: 220 nm Amax: 0.07 λ: 240-400 nm Amax: 0.01 |
| BRN | 1730723 |
| Henry's Law Constant | (atm?m3/mol):
1.24 at 25 °C (approximate - calculated from water solubility and vapor pressure) |
| Exposure limits | ACGIH TLV: TWA 600 ppm (adopted). |
| Dielectric constant | 1.8（20℃） |
| Stability: | Stable. Extremely flammable. Incompatible with strong oxidizing agents. Vapour-air mixtures explosive in certain proportions. Incompatible with rubber, various plastics. The vapour, being heavier than air, may roll over surfaces and collect in low points. Note low flash point. |
| LogP | 3.4 at 20℃ |
| CAS DataBase Reference | 78-78-4(CAS DataBase Reference) |
| NIST Chemistry Reference | Butane, 2-methyl-(78-78-4) |
| EPA Substance Registry System | 2-Methylbutane (78-78-4) |
Description and Uses
2-Methylbutane is used as a chemical intermediate. It acts as a blowing agent for polystyrene and gasoline additive. It is used as a solvent of polyethylene and involved in the preparation of polystyrene foam and polyurethane foam. Further, it is used in a closed loop in geothermal power production to operate turbines. In addition to this, it is used to freeze biological samples like tissues in place of dry ice for cryosectioning in histology.
Safety
| Symbol(GHS) |     GHS02,GHS07,GHS08,GHS09 |
| Signal word | Danger |
| Hazard statements | H224-H304-H336-H411 |
| Precautionary statements | P210-P233-P273-P301+P310-P331-P403+P233 |
| Hazard Codes | F+,Xn,N |
| Risk Statements | 12-51/53-65-66-67 |
| Safety Statements | 9-16-29-33-61-62 |
| RIDADR | UN 1265 3/PG 1 |
| OEB | A |
| OEL | TWA: 120.0 ppm; 350.0 mg/m3, STEL: 610.0 ppm; 1800.0 mg/m3 |
| WGK Germany | 2 |
| RTECS | EK4430000 |
| Autoignition Temperature | 788 °F |
| TSCA | Yes |
| HazardClass | 3 |
| PackingGroup | I |
| HS Code | 29011000 |
| Hazardous Substances Data | 78-78-4(Hazardous Substances Data) |
