Group F
Group F : Atmospheres containing carbon black, charcoal, coal, coke dusts that have more than 8% total volatile material ( coal and coke dusts per ASTM 3175-82) or atmospheres containing these dusts sensitized by other materials so that they present an explosion hazard and having resistivity greater than 102 ohm-centimeter but equal to or less than 108 ohm-centimeter
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