Hot surfaces

Ignition temperature

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↓

↓

Temperature Class

T1 ... T6

Gas Group

A ... C

Temperatur class

Maximum surface temperature

(at max. ambient temperature)

T1

450°C

T2

300°C

T3

200°C

T4

135°C

T5

100°C

T6

85°C

Minimum Ignition Energy

European Groups

USA/Canada Groups

Gas e.g.

< 20 μ Joules

C

A

Acetylene, Carbon disulphide

< 20 μ Joules

B

Hydrogen

< 60 μ Joules

B

C

Ethylether, Ethylene

< 180 μ Joules

A

D

Acetone, Butane, Ethanol, Gasoline, Hexane, Methanol, Methane, Naphtha, Propane