Class 4

Class 4 is divided into three categories:

Flammable Solids are solids (or in a few cases, solids in a molten state) which burn easily in air.

Spontaneously Combustible Substances are liable to heat up and catch fire if they come into contact with air but are normally stable in the absence of air and will not self ignite.

Dangerous When Wet Substances produce flammable (and explosive) gases when they come into contact with water.

Some examples of Class 4 substances are:

Main Hazards:

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