Gases (Class 2) - This class is divided into three subdivisions that include flammable gases, toxic gases and gases that are neither flammable or toxic such as helium and oxygen. 

Toxic and Infections Substances (Class 6) - Class 6 is divided into two subdivisions and includes substances such as cyanide, arsenic, vaccines, and pathology substances. 

Corrosive Materials (Class 8) - Class 8 Does not have any subdivisions and comprises corrosive liquids and solids that will cause severe damage when in contact with lying tissue; or, in the case of leakage, will materially damage or even destroy other goods or the aircraft itself. Corrosive items include battery acids, sulphuric acid, and mercury. 

Miscellaneous (Class 9) - Class 9 is for miscellaneous dangerous items. The class does not have any subdivisions but comprises any substance that may pose a danger during air transport that isn’t covered by the other classes. This includes items with anaesthetic properties, solid dry ice, asbestos, life rafts and chain saws.

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