Fuels and Chemicals and their Ignition Temperatures

The ignition point for some common fuels and chemicals as butane, coke, hydrogen, petroleum and more

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The auto-ignition temperature - the minimum temperature required to ignite a gas or vapor in air without a spark or flame being present - for some common fuels can be found below:

Fuel or Chemical	Temperature
Fuel or Chemical	(^oC)	(^oF)
Acetaldehyde	175	347
Acetone	465	869
Acetylene	305	581
Benzene	560	1040
Bituminous coal	300	572
Butane	420	788
Carbon	700	1292
Carbon monoxide	609	1128
Coal-tar oil	580	1076
Coke	700	1292
Cyclohexane	245	473
Diethyl ether	160	320
Ethane	515	859
Ethylene	490	914
Ehtyl Alcohol	365	689
Fuel Oil No.1	210	410
Fuel Oil No.2	256	494
Fuel Oil No.4	262	505
Heavy hydrocarbons	750	1382
Hydrogen	500	932
Gasoline	280	536
Kerosine	210	410
Isobutane	462	864
Isobutene	465	869
Isooctane	447	837
Isopentane	420	788
Isopropyl Alcohol	399	750
Light gas	600	1112
Light hydrocarbons	650	1202
Methane (Natural Gas)	580	1076
Methyl Alcohol	385	725
Naphtha	550	1022
Neoheaxane	797	425
Neopentane	842	450
n-Butane	761	405
n-Heptane	419	215
n-Hexane	225	437
n-Octane	220	428
n-Pentane	260	500
n-Pentene	298	569
Peat	227	440
Petroleum	400	752
Production gas	750	1382
Propane	480	842
Propylene	458	856
p-Xylene	530	986
Toluene	530	849
Semi anthracite coal	400	752
Styrene	490	914
Wood	300	572
Xylene	463	867

The flammable (explosive) range is the range of a gas or vapor concentration that will burn or explode if an ignition source is introduced. Limiting concentrations are commonly called the lower explosive or flammable limit (LEL/LFL) and the upper explosive or flammable limit (UEL/UFL).

Below the explosive or flammable limit the mixture is too lean to burn and above the upper explosive or flammable limit is too rich to burn. The Auto-Ignition Temperature is not the same as Flash Point - The Flash Point indicates how easy a chemical may burn.

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