Class 3 – Flammable Liquids

Flammable liquids are liquids or liquids containing solids in solution or suspension which give off a flammable vapour at or below 60oC.

These vapours may be ignitable or can react and cause fire or an explosion.

The degree of danger or level of risk of a Class 3 is determined by the flash point and the boiling point of the material. This is described by the packing group. The flammable liquid table below show the criteria.

Flash Point – means the lowest temperature at which the application of an ignition source causes the vapours of a liquid to ignite near the surface of the liquid or within a test vessel.

Boiling Point – The boiling point of a substance is the temperature at which the vapour pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapour.


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