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The flash of the liquid indicates that at which temperature the liquid becomes
explosive when the appropriate concentration of the steam stream appears.

Combustible liquids by flashpoint are divided into two classes:
 inflammable liquids are liquids that, when stored openly, can ignite the
ignition source without any additional heat. Their flash point is up to 61
° C (gasoline, acetone, alcohol, oil, benzene, etc.).
 flammable liquids - their flash point is over 61 ° C (diesel, vegetable
oils, fuel oil, glycerin, lubricants, etc.).

Fire safety signs can be used to identify flammable materials and other fire
hazards (Figure 15.2). „Flammable signs should be placed alongside any potential‟
ignition points or fuel sources as part of a larger fire safety management plan.

Figure 15.2 – Fire safety warning signs

Groups of compatible preservation of substances and materials:
1. Substances that are apt to the formation of explosive mixtures: potassium nitric acid,
potassium chlorate, etc.
2. Constrained and fluid gases:
a) burnt and highly explosive – acetylene, hydrogen, propane;
b) inert and not put out – argon, nitrogen, helium;
c) gases that sustain burning – oxygen, compressed and liquidized air.
3. Self-igniting from water and air substances: potassium, sodium, aluminum dust, zincs
dust, etc.
4. Flammable burnt substances:
a) liquids – petrol, acetone, alcohol;
b) solid substances – celluloid, naphthalene.
5. Substances that can cause combustion: bromine, sulphur acid, potassium aluminate.
6. Easily burnt substances – cotton, hay, peat, sulphur, vegetable and animal soot.

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