Temperature Classes

Ignition temperature

All combustible gases and vapours are categorised according to their ignition temperature.

The ignition temperature (also known as ignition point, auto-ignition temperature, flash-point) is the  temperature to which a material or a contact surface must be heated  so that a combustible substance (solid material, fluid, or their vapours or gases) in the presence of air without sparks, solely as the result of being heated – i.e.: without a source of ignition - ignites itself.

 Some examples of ignition temperature:

  • wood 280-320°
  • cotton 450°
  • cereals 250-320°C
  • coal 240-280°
  • methanol 455°C
  • diesel fuel 255°C

Ignition classes

All electrical and mechanical explosion protected operating facilities must be classified into Temperature Classes in accordance with their maximum surface temperature.
The maximum surface temperature must thus be constantly below the ignition temperature of the surrounding gas or alternatively vapour-air mixture.
For electrical and mechanical operating facilities in a dust atmosphere, classification according to temperature is not compulsory.
The Temperature Classes are laid down in IEC Standard 60079-0.

Temperature class

 

 

 

Highest permissible
surface temperature
of the operating facility in ºC

 

 

 

Ignition temperature of

combustible materials in ºC

T1


450


>450

T2


300


>300   <450

T3


200


>200   <300

T4


135


>135   <200

T5


100


>100   <200

T6


85


>85     <100

Lokalizacje: HUMMEL AG

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