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Workplace health and safety

Home > Workplace health and safety > Subject index A-Z > Hazardous materials > Dangerous goods > Classes of dangerous goods

Classes of dangerous goods

There are nine classes of dangerous goods. Workplace Health and Safety Queensland enforces the storage and handling of a subset of those nine classes, known as "stated dangerous goods and combustible liquids".

These include:

Identifying classes of dangerous goods
Class 2.1 - Flammable gases
Class 2.2 - Non-flammable, non-toxic gases
Class 2.2 - Non-flammable, non-toxic gases sub-risk 5.1 (Oxidising gases)
Class 2.3 - Toxic gases
Class 3 - Flammable liquids
Combustible liquids
Class 4.1 - Flammable solids
Class 4.2 - Substances liable to spontaneous combustion
Class 4.3 - Substances that in contact with water emit flammable gases
Class 5.1 - Oxidising agents
Class 5.2 - Organic peroxides
Class 6.1 - Toxic substances
Class 8 - Corrosive substances
Class 9 - Miscellaneous dangerous goods

Identifying classes of dangerous goods

Schedule 3 of the Dangerous Goods Safety Management Regulation 2001 (PDF, 658 KB) outlines the requirements for the display of information about dangerous goods.

There are requirements for:

The Department of Emergency Services CHEM unit list the diamonds or warning signs associated with each class.

Class 2.1 - Flammable gases

Flammable gases can be ignited in air. They may be lighter or heavier than air. Heavier than air gases can collect in low lying areas such as pits, depressions, and drains causing a fire and explosion hazard.

Examples include:

Class 2.2 - Non-flammable, non-toxic gases

Non-flammable, non-toxic gases are neither flammable or toxic.

Examples include:

Some of these may cause an asphyxiation hazard (e.g. nitrogen, carbon dioxide). When asphyxiating gases are heavier than air they can collect in low lying areas and cause suffocation by the dilution or displacement of oxygen in air.

Class 2.2 - Non-flammable, non-toxic gases sub-risk 5.1 (Oxidising gases)

Oxidising gases are non-flammable, non-toxic gases with a sub-risk of Cass 5.1. These gases, although not flammable, can accelerate combustion and increase the risk of fire in the presence of combustible or flammable materials.

Examples include:

Class 2.3 - Toxic gases

On inhalation these may cause death or injury. Many of these also have other properties (e.g. may be flammable, oxidising or corrosive). Class 2.3 is never used as a subsidiary risk. If a material meets the criteria it will be classified as a toxic gas.

Examples of toxic gases include:

Class 3  - Flammable liquids

Flammable liquids produce vapour that can be ignited in air on contact with a suitable ignition source. By definition these must have a flash point of less than or equal to 60.5 degrees Celsius.

Examples include:

The flash point is the temperature at which a liquid can produce enough vapour to ignite in the presence of an appropriate ignition source.

Combustible liquids

Combustible liquids are not classified as dangerous goods but are designated as either C1 or C2 combustible liquids.

A C1 combustible liquid has a flashpoint between 60.5°C to 150 °C.

A C2 combustible liquid has flashpoint exceeding 150°C.

This information can be obtained by reviewing the chemical and physical properties of a material safety data sheet (MSDS).

An example of a C1 combustible liquid is diesel fuel. Many lubricating oils and cooking oils are examples of C2 combustible liquids.

Class 4.1 - Flammable solids

These materials are easily ignited and may cause fire through friction heat or other ignition sources. 

Examples include: red phosphorous, hexamine, naphthalene, and camphor.

Class 4.2 - Substances liable to spontaneous combustion

These materials are flammable solids that a capable of spontaneous combustion being heated up in contact with air or moisture in air. Examples include:

Class 4.3 - Substances that in contact with water emit flammable gases

On contact with water these materials can become spontaneously combustible or liberate flammable or toxic gases.

Examples include:

Class 5.1 - Oxidising agents

These substances can contribute/accelerate the combustion of other combustible or flammable materials.

Examples include:

Class 5.2 - Organic peroxides

Organic peroxides are organic materials containing the peroxide reactive group (-O-O-). These chemicals may have the following properties:

Examples include:

Class 6.1 - Toxic substances

These materials comprise substances liable to cause death or serious injury or harm from inhalation, ingestion or absorption through the skin. Some toxic materials may have other sub-risks (e.g. flammable or corrosive). 

Examples include:

Class 8 - Corrosive substances

Corrosive materials are capable of causing the degradation and destruction of living tissue, steel and other materials on contact. Some may give off irritating vapours affecting the eyes, airways and skin. 

Corrosive material may possess other properties (e.g. flammability or oxidation). Corrosive materials are either acids or bases/alkalis.

Examples of acids include:

Examples of alkalis include:

Class 9 - Miscellaneous dangerous goods

This class comprises substances and articles that present a danger not offered by other classes. Some of the materials may be assigned to this class based on temperature properties (e.g. elevated temperature products).

Examples of class 9 goods include:

Last updated 21 August 2008