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Class 4.2: Flammable solids.


Flammable Solids Spontaneously Combustible material is a pyrophoric material, which is a liquid or solid that can ignite within five (5) minutes after coming in contact with air or a self-heating material that when in contact with air and without an energy supply is liable to self-heat.
Class
Class 1.
Explosives

Class 2.
Gases

Class 3.
Flammable Liquids

Class 4.1.
Flammable Solids or Substances

Class 4.2.
Flammable solids

Class 4.3.
Substances which, in contact with water, emit flammable gases

Class 5.1.
Oxidizing substances (agents) by yielding oxygen increase the risk and intensity of fire

Class 5.2.
Organic peroxides - most will burn rapidly and are sensitive to impact or friction

Class 6.1.
Toxic substances

Class 6.2.
Infectious substances

Class 7.
Radioactive Substances

Class 8.
Corrosives

Class 9.
Miscellaneous dangerous substances and articles