Flash Point - Fuels

Some common fuels and their flash points

• The flash point of a chemical 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.

Some fuels and their flash points at atmospheric pressure are indicated below:

The flash point of a chemical is the lowest temperature where it will evaporate enough fluid 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.

Hazard	Flash Point
Very Low Hazard	Flash point > 200oF (93oC)
Moderate Low Hazard	Flash point 150oF to 200oF (66oC to 93oC)
High to Moderate Hazard	Flash point 100oF to 150oF (38oC to 66oC)
Extreme to High Hazard	Flash point 0oF to 100oF (-18oC to 38oC)
Extreme Hazard	Flash point < 0oF (-18oC)

An open flame is not always necessary to ignite the gas. A hot surface like a heating element or warm machine will do for chemicals with more than high hazard.

Fuel	Flash Point (oF)
Acetaldehyde	-36
Acetone	0
Benzene	12
Biodiesel	266
Carbon Disulfide	-22
Diesel Fuel (1-D)	100
Diesel Fuel (2-D)	126
Diesel Fuel (4-D)	130
Ethyl Alcohol, Ethanol	63
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
Gasoline	-45
Gear oil	375 - 580
Iso-Butane	-117
Iso-Pentane	less than -60
Iso-Octane	10
Jet fuel (A/A-1)	100 - 150
Kerosene	100 - 162
Methyl Alcohol	52
Motor oil	420 - 485
n-Butane	-76
n-Pentane	less than -40
n-Hexane	-7
n-Heptane	25
n-Octane	56
Naphthalene	174
NeoHexane	-54
Propane	-156
Styrene	90
Toluene	40
Xylene	63