IMO Classes for Dangerous Goods

IMO Classes Class 1. Explosives Class 2. Gases Class 3. Flammable Liquids Class 4.1. Flammable Solids or Substances Class 4.2. Flammable solids Class 4.3. Substances which, in contact with water, emit flammable gases Class 5.1. Oxidizing substances (agents) by yielding oxygen increase the risk and intensity of fire Class 5.2. Organic peroxides - most will burn rapidly and are sensitive to impact or friction Class 6.1. Toxic substances Class 6.2. Infectious substances Class 7. Radioactive Substances Class 8. Corrosives Class 9. Miscellaneous dangerous substances and articles
Class 6.1

Toxic, poison substances

Known to be toxic to humans so as to afford a hazard to health during transportation or is presumed to be toxic to humans because it falls within a toxic category when tested on laboratory animals.

An irritating material such as tear gas that causes extreme irritation, especially in confined spaces.