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. 

Flammable Liquids (Class 3) - Class 3 comprises liquids or mitures of liquids that will give off flammable vapours at specific temperatures and hav a flash point of not more than 60.5 degrees Celsius / 140.9 degrees Fahrenheit.

Flammable Solids (Class 4) - Flammable solids are divided into 3 subdivisions that include highly flammable solids, solids that are likely to spontaneously and substances that, if they come into contact with water, emit flammable gases. 

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