Information
| Class | Sub-Class | Symbol |
| Class 2 Gases | Class 2.1 Flammable Gases |  |
| Class 2.2 Non-flammable, Non-toxic gases |  | |
| Class 2.3 Poisonous gas |  | |
| Class 3 Flammable liquids | | |
| Class 4 Flammable solids | Class 4.1 Flammable solids, self-reactive and related substances and desensitised explosives | |
| Class 4.2 Spontaneously combustible |  | |
| Class 4.3 Dangerous when wet |  | |
| Class 5 Oxidising substances | Class 5.1 Oxidising agent |  |
| Class 5.2 -Organic peroxides (liquid or solid) |  | |
| Class 6.1 Poisons |  | |
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| Class 6.2 Infectious substances |  | |
| Class 8 Corrosives |  | |
| Class 9 Miscellaneous goods |  |
Hazchem (UK Hazard Identification System) is a UK system for managing chemicals and information. The most obvious manifestation are the boards carried by vehicles transporting chemicals, which state the possible hazard they present, e.g. corrosive or flammable.
The boards contain the UN recognised product number for identification, emergency response codes for pre-hospital personnel and a 24-hour contact number for more information.
Toxbase and National Poisons Information Service are also useful which has a compendium of chemical hazards commissioned by Public Heath England