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Hazard vs. Flash Points

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.

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

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.

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