Combustible Material (Class I, Division) 4
Combustible Material (Class I, Division) 4 :
Group B: 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 less than or equal to 0. 45 mm or a minimum igniting current ratio (MIC ratio) less than or equal to 0. 40. Note: A typical Class I, Group B material is hydrogen
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