The Difference Between Explosion-Proof Level CT6 and BT6

IIBT6

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

Class IIB is designated for environments with hazardous gases like ethylene, where T6 specifies that explosion-proof electrical devices must maintain a surface temperature below 85°C.

IICT6

Class IIC applies to extremely hazardous areas with gases such as hydrogen, acetylene, and carbon disulfide. T6 classification ensures that these explosion-proof devices also maintain a maximum surface temperature of no more than 85°C.

Although both classes are rated T6, equipment under Class IIC offers enhanced safety. Consequently, IICT6 holds a higher explosion-proof rating than IIBT6.