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Flash Points - Liquids

The flash points for some common liquids and fuels.

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The flash point of a chemical substance is the lowest temperature where enough fluid can evaporate to form a combustible concentration of gas.

The flash point is an indication of how easy a chemical may burn. Materials with higher flash points are less flammable or hazardous than chemicals with lower flash points.

burning flames

Some liquids and their flash points at atmospheric pressure:

See also Autoignition temperature and flash point of different hydrocarbons

Liquids - Flash Points
FuelFlash Point
( o F )
Acetaldehyde -36
Acetone 0
Acentonitrile 43
Acrylonitrile 32
Allyamine -20
Aniline 158
Anisole 126
Benzene 12
Benzaldehyde 145
Biodiesel 266
Butanal -7.6
n-Butane -76
1-Butanol 99
Carbon Disulfide -22
Cyclohexanone 111
Diesel Fuel (1-D) 100
Diesel Fuel (2-D) 126
Diesel Fuel (4-D) 130
Diethanolamine 342
Diethylene glycol diethyl ether 180
Diethyl ether -49
Diisopropyl ether -18
Dimethyl sulfate 181
Dimethyl sulfide -35
Ethyl Alcohol (Ethanol) 63
Ethylamine 3.2
Formaldehyde 185
Fuels Oil No.1 100 - 162
Fuels Oil No.2 126 - 204
Fuels Oil No.4 142 - 240
Fuels Oil No.5 Lite 156 - 336
Fuels Oil No.5 Heavy 160 - 250
Fuels Oil No.6 150
Furfural 140
Furfuryl alcohol 167
Gasoline -45
Gear oil 375 - 580
Hexylamine 84
Iso-Butane -117
Iso-Pentane less than -60
Iso-Octane 10
Isopropylbenzene hydroperoxide 347
Jet fuel (A/A-1) 100 - 150
Kerosene (paraffin) 100 - 162
Methyl Alcohol (Methanol) 52
Methylamine 32
Motor oil 420 - 485
Naphtha 32 - 86
n-Pentane less than -40
n-Hexane -7
n-Heptane 25
n-Octane 56
Naphthalene 174
NeoHexane -54
Paraldehyde 97
Peroxyacetic acid 106
Petroleum ether < 0
Propanal -22
Propane -156
2-Propanol 54
Propylamine -35
Styrene 90
Tetrohydrofuran 151
Toluene 40
Triethanolamine 354
Triethylamine 19
o-Xylene 63
m-Xylene 81
p-Xylene 81
  • T( oC) = 5/9[T( o F) - 32]
Note! - the Auto-Ignition Temperature is not the same as Flash Point - The Auto-Ignition Temperature indicates the minimum temperature required to ignite a gas or vapor in air without a spark or flame being present . Temperature classification of equipment in hazardous areas are related to surrounding substances auto-ignition temperature.
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