Hazard Diamonds & Classes

Hazardous Chemicals and Dangerous Goods are transported throughout the United Kingdom, by road and by rail, every day. These goods include dangerous chemicals such as:

Although the Health and Safety Executive is primarily responsible for enforcing the many regulations designed to ensure safety while these substances are in transit, it is the members of the emergency services who will have to deal with the consequences of any incident.

Laid out below are the UN Hazard classes and danger signs. To find out what each Class number is and what each sign represents, please refer to the list at the foot of this page.

Class 1 - Explosives     Class 1 - Explosives     Class 1 - Explosives
Class 1

Class 2 - Flammable Gas     Class 2 - Non-flammable Gas     Class 2 - Toxic Gas
Class 2

Class 3 - Flammable Liquid     Class 4.1 - Flammable Solid     Class 4.2 - Liable to Spontaneous Combustion     Class 4.3 - Flammable on contact with Water
Classes 3 and 4

Class 5.1 - Oxidising Agent     Class 5.2 - Organic Peroxide     Class 6.1 - Toxic     Class 6.2 - Infectious Substance
Classes 5 and 6

Class 7 - Radioactive Material     Class 7.1 - Radioactive Material     Class 7.2 - Radioactive Material
Class 7

Class 8 - Corrosive     Class 9 - Miscellaneous
Classes 8 and 9

UN Hazard Classes

Class Number Hazard Class Information
Class 1 Explosive
1.1 Substances with a mass explosion hazard
1.2 Substances which present a projection hazard but no mass explosion hazard
1.3 Substances which present both a fire hazard and a minor blast or projection hazard (or both) but not a mass explosion hazard
1.4 No significant hazard
1.5 Very insensitive substances with a mass explosion hazard
1.6 Very insensitive articles with no mass explosion hazard
Class 2 Gases
2.1 Flammable gases
2.2 Non-flammable, non-toxic gases
2.3 Toxic gases
Class 3 Flammable liquids
Class 4 Flammable solids
Class 4.1 Flammable solids, self-reactive substances and solid desensitised explosives
Class 4.2 Materials liable to spontaneous combustion
Class 4.3 Substances which, in contact with water, release flammable gases
Class 5 Oxidizing substances and organic peroxides
Class 5.1 Oxidizing agents
Class 5.2 Organic peroxides
Class 6 Toxic and infectious substances
Class 6.1 Toxic substances
Class 6.2 Infectious substances
Class 7 Radioactive substances and articles
Class 8 Corrosive substances
Class 9 Miscellaneous dangerous substances and articles. Class 9 includes items such as asbestos, automotive airbags, lithium batteries and environmentally hazardous substances which don't fit into any of the other 8 classes.

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