Class 1 - Explosives Substances that can explode

Class 2 - Gases Compressed, liquefied or dissolved gases

Class 3 - Flammable liquids Liquids with low flash point

Class 4 - Flammable solids Solids that can easily ignite

Class 5 - Oxidizing substances Substances that release oxygen

Class 6 - Toxic substances Substances that can cause harm by inhalation, ingestion or skin absorption

Class 7 - Radioactive materials Materials that emit ionizing radiation

Class 8 - Corrosive substances Substances that can damage living tissue or materials

Class 9 - Miscellaneous dangerous substances Substances that present hazards not covered by other classes