| Melting point: |
323-329 °C(lit.) |
| Boiling point: |
34 °C(lit.) |
| Density |
0.681 g/mL at 25 °C(lit.) |
| vapor density |
2.35 (vs air) |
| vapor pressure |
8.82 psi ( 20 °C) |
| refractive index |
n20/D 1.422(lit.) |
| Flash point: |
−65 °F |
| storage temp. |
Store at <= 20°C. |
| solubility |
0.7g/l |
| form |
solid |
| pka |
>14 (Schwarzenbach et al., 1993) |
| color |
Clear colorless to very pale yellow |
| Odor |
petroleum-like odor |
| Odor Threshold |
0.048ppm |
| explosive limit |
1-9.7%(V) |
| Water Solubility |
0.07 g/100 mL |
| FreezingPoint |
-145.96℃ |
| λmax |
231nm(neat)(lit.) |
| Merck |
14,5201 |
| BRN |
969158 |
| Henry's Law Constant |
(x 10-2 atm?m3/mol):
3.45 at 18 °C (dynamic stripping cell-MS, Karl et al., 2003) |
| Dielectric constant |
2.1（25℃） |
| Stability: |
Stability Extremely flammable. Readily forms explosive mixtures with air. Note low flash point, low boiling point, high vapour pressure. Unstable - prone to spontaneous polymerization. May contain a polymerization inhibitor. Incompatible with strong oxidizing agents. |
| LogP |
2.42 at 20℃ |
| CAS DataBase Reference |
78-79-5(CAS DataBase Reference) |
| IARC |
2B (Vol. 60, 71) 1999 |
| NIST Chemistry Reference |
1,3-Butadiene, 2-methyl-(78-79-5) |
| EPA Substance Registry System |
Isoprene (78-79-5) |