This class has no subdivisions. It comprises liquids or mixtures of liquids containing solids in solution or in suspension that give off a flammable vapour at temperatures not greater than 60^oC closed cup test. e.g. alcohol, petrol, paint, polishes, adhesives

This class is further classified into packing groups I, II or III according to degree of danger, which is determined according to their flash and boiling point.

The packaging group for class 3 is determined by utilizing Table 3.3.A of IATA Dangerous Goods Regulations.

For ease of reading this table it is always best to determine the boiling point first, then determine the flash point.

Division 4.1 Flammable solid
These are solids that under conditions encountered in air transport, are readily combustible or may cause or contribute to fire through friction. Also includes substances that could undergo strong endothermic reaction, or explode if not wetted with water or alcohol.
e.g. matches, sulphur, celluloid (film)

Division 4.2 Substances liable to spontaneous combustion
These are solids that are liable to spontaneous heating under normal conditions encountered in transport, or to heating up in contact with air, and being able to catch fire.
e.g. Copra (coconut meat), white phosphorus

Division 4.3 Substances which, in contact with water, emit flammable gases
Substances which, by interaction with water, are liable to become spontaneously flammable or give off flammable gas in dangerous quantities. Such mixtures are easily ignited by all ordinary sources of ignition.
e.g. lithium, calcium, potassium, aluminium

Division 5.1 Oxidizing substances
Oxidizing substances are substances that in themselves are not necessarily combustible but may generally cause or contribute to the combustion of other material by yielding oxygen. Such substances may be contained in an article.
e.g. pool chlorine, oxygen generators, bleaches, calcium carbonate, sodium

• be liable to explosive decomposition
• burn rapidly
• be sensitive to impact or friction
• react dangerously with other substances, and
• cause damage to the eyes

e.g. tert/Butylhydroperoxide