IMDG/IMCO Codes are set by the International Maritime Organization for the safe transportation of dangerous goods by vessel and to prevent marine pollution:

Class 1 – Explosives

1.1; 1.2; 1.3; 1.4; 1.4s; 1.5

Class 2 – Gases

2.1 Flammable gas
2.2 Non-Flammable Gas
2.3 Poisonous or harmful gas

Class 3 – Flammable Liquids

3.1 Flashpoint from 0 to minus 18 C
3.2 Flashpoint from 0 to plus 23 C
3.3 Flashpoint from plus 23 C to plus 60 C

Class 4 – Flammable Solids

4.1 Flammable solids
4.2 Solids liable to spontaneously combust
4.3 Solids that become unstable when wet

Class 5 – Oxidising Agents

5.1 Oxidising agents
5.2 Organic agents or peroxides

Class 6 – Poison / Harmful Substances

6.1 Solid or liquid poisons
6.2 Biohazardous cargo

Class 7 – Radioactive Cargo

6.1 Solid or liquid poisons
6.2 Biohazardous cargo

Class 8 – Corrosive Cargo

6.1 Solid or liquid poisons
6.2 Biohazardous cargo

Class 9 – Other Dangerous Cargos

6.1 Solid or liquid poisons
6.2 Biohazardous cargo