ADR Courses

Class 3 - Flammable Liquids

Flammable liquids all evaporate easily and the vapour will burn or explode when heated in the air. The vapours are invisible and always much heavier than air. They will flow downhill and collect at the lowest point. The flashpoint in the temperature above which the liquid releases just enough vapour to create an ignitable mixture with air. The lower the flashpoint, the quicker the vapour forms and the greater the risk. The FP of petrol is -40 degrees, so it burns readily. The FP of diesel is +65 degrees, so it has to be heated before it will burn.

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