The flash point of a chemical indicates how easy it may ignite and burn.
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.
|Very Low Hazard|| > 200oF
|Moderate Low Hazard||150oF to 200oF
(66oC to 93oC)
|High to Moderate Hazard||100oF to 150oF
(38oC to 66oC)
|Extreme to High Hazard||0oF to 100oF
(-18oC to 38oC)
|Extreme Hazard||< 0oF
An open flame is not always necessary to ignite a gas. A hot surface - like a heating element or warm machine - will do for chemicals with more than high hazard.
See Autoignition temperature and flash point of different hydrocarbons and Flash Point - Fuels for measured values of flash point.
The Flash Point is not the same as the Auto-Ignition Temperature. The Auto-Ignition Temperature is the minimum temperature required to ignite a gas or vapor in air without a spark or flame present.