International Maritime Dangerous Goods Code Class Name 1 Explosives 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 2 Gases (compressed, liquefied or dissolved under pressure) 2.1 Flammable gases 2.2 Non-flammable, Non-toxic compressed gases 2.3 Toxic gases 3 Flammable liquids 3.1 Low flashpoint group below -18° C 3.2 Intermediate flashpoint group of -18° C to and not including 23° C 3.3 High flashpoint of 23° C up to and including 61° C 4.1 Flammable solids 4.2 Substances liable to spontaneous combustion 4.3 Substances which in contact with water, emit flammable gases 5.1 Oxidising substances 5.2 Organic peroxides (Note: Some require secondary explosive labels) 6.1 Toxic substances (liquids and solids) 6.2 Infectious substances 7 Radioactive materials 8 Corrosives (liquids and solids) 9 Miscellaneous dangerous substances and articles