What Does Explosion-Proof Level CT6 Mean

IIC designations are used in environments containing hazardous gases like hydrogen, acetylene, and carbon disulfide, while IIIC designations apply to areas with conductive dust.

Gas Classification	Temperature Group
-	T1	T2	T3	T4	T5	T6
-	T＞450	450≥T＞300	300≥T＞200	200≥T＞135	135≥T＞100	100≥T＞85
I	Methane
IIA	Ethane, Propane, Acetone, Phenethyl, Ene, Aminobenzene, Toluene, Benzene, Ammonia, Carbon Monoxide, Ethyl Acetate, Acetic Acid	Butane, Ethanol, Propylene, Butanol, Acetic Acid, Butyl Ester, Amyl Acetate Acetic Anhydride	Pentane, Hexane, Heptane, Decane, Octane, Gasoline, Hydrogen Sulfide, Cyclohexane, Gasoline, Kerosene, Diesel, Petroleum	Ether, Acetaldehyde, Trimethylamine		Ethyl Nitrite
IIB	Propylene, Acetylene, Cyclopropane, Coke Oven Gas	Epoxy Z-Alkane, Epoxy Propane, Butadiene, Ethylene	Dimethyl Ether, Isoprene, Hydrogen Sulfide	Diethylether, Dibutyl Ether
IIC	Water Gas, Hydrogen	Acetylene			Carbon Disulfide	Ethyl Nitrate

The ‘T’ classification indicates the maximum surface temperature of equipment: T1 up to 450°C, T2 up to 300°C, T3 up to 200°C, T4 up to 135°C, T5 up to 100°C, and T6 up to 85°C.

The T6 classification is the highest, signifying the lowest permissible surface temperature.