Incoterms 2000 Click to view schema: The UN/IMDG classes for Hazardous cargoes: Class 1: Explosives Class 6: Poisonous (toxic) and infectious substances Class 2: gases Compressed, liquefied or dissolved under pressure or liquefied by refrigiration Class 7: Radioactive substances Class 3: Inflammable liquids Class 8: Corrosives Class 4: Inflammable solids or substances Class 9: Miscellaneous dangerous substances Class 5: Oxidising substances (agents) and organic peroxides