Class I
(Acetylene, Hyrdogen, Ethylene, Propane)
(Hazard Likely)
(Hazard Not Likely)
Class II
(Metals[Div.1 only], Coal, Grain)
(Hazard Likely)
(Hazard Not Likely)
Class III
(Machined Magnesium)
(Hazard Likely)
(Hazard Not Likely)
Division 1:
Where volatile substances can exist all of the time or some of the time under normal operating conditions.
Division 2:
Where volatile substances are not likely to exist under normal operating conditions.