Dangerous Goods

Class 1 - Explosives
Class 2 - Gases
Class 3 - Inflammable Liquids
Class 4 - Inflammable Solids, self-inflammable Materials
Class 5 - Igniting (oxidating) Materials and organic Peroxides
Class 6 - Poisonous Goods
Class 7 - Radioactive Goods
Class 8 - Corrosive Materials
Class 9 - Miscellaneous dangerous Materials

http://www.unece.org/trans/danger/danger.htm