Dangerous goods are categorised by UN numbers to determine how hazardous they are to travel by road and sea. See the below table providing information on how hazardous goods are managed. 

 

UN Class Dangerous Goods Division(s) Classification
1 Explosives 1.1 - 1.6 Explosive
2 Gases 2.1 Flammable Gas
2.2 Non-Flammable , non-toxic gas
2.3 Toxic gas
3 Flammable liquid 3 Flammable liquid
4 Flammable solids 4.1 Flammable solid
4.2 Spontaneously combustible substance
4.3 Substance which in contact with water emits flammable gas
5 Oxidising substances 5.1 Oxidising substances
5.2 Organic peroxide
6 Toxic substances 6.1 Toxic substance
6.2 Infectious substance
7 Radioactive material 7 Miscellaneous dangerous goods
8 Corrosive substance 8 Corrosive substance
9 Miscellaneous dangerous goods 9 Miscellaneous dangerous goods