Human Resources

Flammable & Combustible Solvents

Flammable solvents are widely used in laboratories and represent fire hazards which are often ignored. This page provides basic definitions and a list of precautions which need to be followed.

Important Definitions:

Flash Point

The lowest temperature of a liquid at which it gives off enough vapour to form an ignitable mixture of vapour and air immediately above the surface of the liquid.

Autoignition Temperature

The minimum temperature required to initiate or cause self-sustained combustion, in the absence of a spark or flame.

The Lower Explosive (flammable) Limit (LEL)

The lowest concentration of vapour in air which will burn or explode upon contact with a source of ignition.

The Upper Explosive (flammable) Limit (UEL)

The highest concentration of vapour in air which will burn or explode upon contact with a source of ignition.

Open Flames

The use of open flames should be avoided. However, if used: