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The 9 Classes of Dangerous Goods

13 / 03 / 2018
The 9 Classes of Dangerous Goods Image 1


Generally speaking, dangerous items are usually moved by surface transport rather than by air. However, regulations are in place to allow safe air transport if required, which enables dangerous goods to be carried on commercial airlines, private charters and cargo flights.


In order to carry dangerous goods safely, certain principles must be adopted that prevent the aircraft and its occupants from being put at risk.

Dangerous items can be carried safely when appropriate measures have been taken and they are deemed safe.

No matter how cargo is being transported, it must comply with The United Nations (UN) nine hazard classes for dangerous goods.


Explosive materials (Class 1)

Class 1 items are not usually shipped by air and are divided into 6 subdivisions. They cover substances that have an explosion hazard, explosions that may project fragments and firebrands, and fire hazards.

Explosive materials (Class 1)

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.

Gases (Class 2)

Flammable Liquids (Class 3)

Class 3 comprises liquids or mixtures of liquids that will give off flammable vapours at specific temperatures and have a flash point of not more than 60.5 degrees Celsius / 140.9 degrees Fahrenheit.

Flammable Liquids (Class 3)

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.

Flammable Solids (Class 4)

Oxidising Substances and Organic Pesticides (Class 5)

This class is divided into two subdivisions and covers agents that react with oxygen and organic pesticides.

Oxidising Substances and Organic Pesticides (Class 5)

Toxic and Infections Substances (Class 6)

Class 6 is divided into two subdivisions and includes substances such as cyanide, arsenic, vaccines and pathology specimens.

Toxic and Infections Substances (Class 6)

Radioactive Materials (Class 7)

Class 7 covers materials that have a specific activity greater than 70 kilobecquerels per kilogram.

Radioactive Materials (Class 7)

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 living tissue; or, in the case of leakage, will materially damage or even destroy other goods or the aircraft itself. Corrosive items include battery acids, sulfuric acid and mercury.

Corrosive Materials (Class 8)

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.

Miscellaneous (Class 9)

Dangerous Goods by Air (HCA Accredited) Training 


Next Steps

OPITO recently revised their Helideck Operations Initial Training (HOIT) Standard to include a prerequisite for candidates to undertake an approved dangerous goods awareness course. Our course is approved by the Helicopter Certification Agency and is suitable to use as a precursor to the OPITO training.

Learn More about Dangerous Goods by Air by taking the online dangerous goods by air course.