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NOTE: This is an unformatted excerpt from our online fire protection training library.

Identifying Materials & Equipment

Liquids, Vapors & Gases

Group D

Definition: Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a maximum experimental safe gap (MESG) value greater than 0.75 mm or a minimum igniting current ratio (MIC ratio) greater than 0.80.

Typical Group D materials are gasoline and propane.


Zone Groups
NOTE: This is an unformatted excerpt from our online fire protection training library.

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