Classes of Hazardous Materials

  • Class 1: Explosives
  • Class 2: Gases
  • Class 3: Flammable and combustible liquids. A flammable liquid has a flashpoint of not more than 60 degrees C (140 F). A combustible liquid has a flash point above 60.5 degrees C ( 141 F) and below 93 degrees C (200 F).
  • Class 4: Flammable solids
  • Class 5: Oxidizers and organic peroxides
  • Class 6: Poisons
  • Class 7: Radioactive materials. A material, liquid or solid, that causes visible destruction or irreversible alteration to human skin or a liquid that has a severe corrosion rate on steel or aluminum.
  • Class 9: Miscellaneous. A material which presents a hazard during transport, but which is not included in any other hazard class (such as a hazardous substance or a hazardous waste).
  • ORM-D: Other regulated material. A material which, although otherwise subjected to regulations, presents a limited hazard during transportation due to its form, quantity and packaging.

More information

Information about handling of specific hazardous chemicals (MSDS standard sheets).

General information about Occupational Health and Safety, courtesy of OSHA.