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Temperature classes:

Since all hazardous substances can be ignited by a heated surface, these substances have been divided into various temperature classes.


Temperature classes:

Table below shows the various temperature classes with the corresponding maximum surface temperatures:

Temperature classes and maximum surface temperatures

TEMPERATURE CLASS
MAXIMUM SURFACE
TEMPERATURE
IGNITION TEMPERATURE OF
COMBUSTIBLE MATERIAL
T1
450°C
> 450°C
T2
300°C
> 300°C
T3
200°C
> 200°C
T4
135°C
> 135°C
T5
100°C
> 100°C
T6
85°C
> 85°C


Gas, vapour or dust groups:

Table below shows various gases divided into temperature classes and divided into gas groups:

Temperature classes of gases

TEMPERATURE CLASSES
 
T1
T2
T3
T4
T5
T6
GROUP
1
Methane
               
2A
Acetone Ammonia
Benzene
Carbon Monoxide
Methanol
Propane
Ethyl-Alcohol
n. Butane
Petrol
Diesel
Aircraft
Fuel
Acetaldehyde
2B
Town gas
Ethylene
2C
Hydrogen
Acetylene
Carbon
Disulphide
Ethyl
Nitrate