Discrimen INTER CREPITUS-Probatio Level AT et CT

Classes A et C notantur locis in quibus materiae ancipitia reponuntur, cum superiore CREPITUS-probationem rating de CT.

Gas group / temperatus group	T1	T2	T3	T4	T5	T6
IIA	Formaldehyde, toluene, yl ester, acetylene, propane, acetone, Donec acidum, benzene, styrene, carbo carbonis, ethyl acetate, Acidum acetic, chlorobenzene, yl acetate, chlorine	Methanol, ethanol, ethylbenzene, propanol, propylene, butanol, butyl acetate, amyl acetate, cyclopentane	Pentane, pentanol, hexane, ethanol, heptane, octane, cyclohexanol, terebinthinae, naphtha, petroleum (inter gasoline), cibus oleum, pentanol tetrachloride	Acetaldehyde, trimethylamine		Ethyl nitrite
IIB	Propylene ester, aether amino	Butadiene, epoxy propane, ethylene	Dimethyl aether, acrolein, hydrogenii carbide
IIC	Hydrogenium, aqua gas	Acetylene			Carbon disulfide	Ethyl nitrate

In Sinis, Classis A typice includit sites continentur propanediyl, Class C autem ambit areas gasorum sicut hydrogenii et acetylenae.