The Difference Between Explosion-Proof Level AT and CT

Classes A and C denote locations where hazardous materials are stored, with a higher explosion-proof rating of CT.

Gas group/temperature group	T1	T2	T3	T4	T5	T6
IIA	Formaldehyde, toluene, methyl ester, acetylene, propane, acetone, acrylic acid, benzene, styrene, carbon monoxide, ethyl acetate, acetic acid, chlorobenzene, methyl acetate, chlorine	Methanol, ethanol, ethylbenzene, propanol, propylene, butanol, butyl acetate, amyl acetate, cyclopentane	Pentane, pentanol, hexane, ethanol, heptane, octane, cyclohexanol, turpentine, naphtha, petroleum (including gasoline), fuel oil, pentanol tetrachloride	Acetaldehyde, trimethylamine		Ethyl nitrite
IIB	Propylene ester, dimethyl ether	Butadiene, epoxy propane, ethylene	Dimethyl ether, acrolein, hydrogen carbide
IIC	Hydrogen, water gas	Acetylene			Carbon disulfide	Ethyl nitrate

In China, Class A typically includes sites containing propane, whereas Class C encompasses areas with gases like hydrogen and acetylene.