Octane
| General |
| Molecular formula |
C8H18 |
|
CAS number
|
111-65-9 |
|
EC number
|
203-892-1 |
| Annex I Index number |
601-009-00-8 |
| Physical characteristics |
| Appearance |
Colourless liquid |
| Melting point |
-57° Celsius
|
| Boiling point |
126° Celsius |
| Vapour density |
- |
| Vapour pressure |
11 mm Hg at 20° Celsius
|
| Specific gravity |
0.703 |
| Flash point |
15° Celsius (closed cup) |
| Explosion limits |
0.96 - 6.5 % |
| Autoignition temperature |
220° Celsius |
| Critical temperature |
295.7° Celsius |
Octane is an alkane hydrocarbon with the chemical formula CH3(CH2)6CH3. It has many isomers.
One of the isomers, the iso-octane 2,2,4-trimethylpentane , is of major importance, as it has been selected as the 100 point on the octane rating scale, with n-heptane as the zero point. Octane ratings are ratings used to represent the anti-knock performance of petrol, given as the percentage of 2,2,4-trimethylpentane in an 2,2,4-trimethylpentane / n-heptane mixture that would have the same performance. It is an important constituent of gasoline.
See also
External links
Last updated: 05-07-2005 14:11:57
Last updated: 05-13-2005 07:56:04
