Dangerous goods class
Level 1: Explosives
Grade 2: Gas
Class 3: flammable liquids
Class 4: flammable solids, substances liable to spontaneous combustion, substances that give off flammable gases in contact with water
Grade 5: oxidants and organic peroxides
Class 6: toxic and infectious substances
Grade 7: Radioactive material
Grade 8: Corrosive
Class 9: miscellaneous hazardous substances and articles