Wilhelm  Jost  Institut Förderverein e.V.

Lower Explosion Point (LEP)


 The lower point of explosion is the temperature of a combustible liquid where the concentration of saturated steam in air is equal to the lower explosion limit.


Testing Method:

according to BG Chemie R 003 6/2000


Safety-relevant meaning:


The lower point of explosion permits a more exact definition of the explosion limits than the flash point. Due to the complex determination however it is only rarely  measured in a direct manner.

Usually an estimation is made by the flash point. If the maximum processing temperature lies over the lower explosion point of  the liquid, then explosive steam /air mixtures can develop. If liquids are distributed in droplets the possibility of combustible atmospheres has to taken into account at temperatures below the LEP.