The classifications of dangerous goods are those defined by the United Nations Committee of Experts on the Transport of Dangerous Goods and subsidiary bodies (ST/SG/AC.10/1/Rev.5).
There are nine classes of dangerous goods:
1. explosives;
2.gases;
3.flammable liquids;
4. flammable solids, substances liable to spontaneous combustion, substances which, on contact with water emit flammable gases;
5. oxidizing substances, organic peroxides;
6. poisonous (toxic) and infectious substances;
7. radioactive material;
8. corrosives; and,
9. miscellaneous dangerous substances.