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| 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 these, isooctane (2,2,4-trimetylpentane), is especially important, because its octane rating is by definition 100. It is an important constituent of petrol.
| Alkanes | |||||||||||||||||||||||||||||||
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methane CH4 |
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ethane C2H6 |
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propane C3H8 |
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butane C4H10 |
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pentane C5H12 |
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hexane C6H14 | |||||||||||||||||||||
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heptane C7H16 |
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octane C8H18 |
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nonane C9H20 |
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decane C10H22 |
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undecane C11H24 |
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dodecane C12H26 |
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tridecane C13H28 |
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tetradecane C14H30 |
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pentadecane C15H32 |
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hexadecane C16H34 |
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heptadecane C17H36 |
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octadecane C18H38 |
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nonadecane C19H40 |
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icosane C20H42 |
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henicosane C21H44 |
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docosane C22H46 |
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tricosane C23H48 |
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tetracosane C24H50 |
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pentacosane C25H52 |
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hexacosane C26H54 |
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heptacosane C27H56 |
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octacosane C28H58 |
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nonacosane C29H60 |
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triacontane C30H62 |
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hentriacontane C31H64 |
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dotriacontane C32H66 |
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tritriacontane C33H68 |
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tetratriacontane C34H70 |
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pentatriacontane C35H72 |
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hexatriacontane C36H74 |
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