Dangerous Goods Classes

Dangerous Goods are articles or substances which are capable of posing a significant risk to health, safety, or property when transported.

The international community has created a classification system of nine primary classes of dangerous goods. Some classes have been sub-divided in order to adequately describe the nature of the properties of the individual goods.

There is a label for each class/division to convey the nature of the hazard. These labels must appear on the outside of the package when it is offered for transport and must remain on the package while it is in transit. They will also be found on most inner packages such as aerosol cans; bottles of bleach, containers of thinners, tins of paint etc.

Click on a each class below to read more details.

  1. Explosives
  2. Gases
  3. Flammable Liquids
  4. Flammable Solids
  5. Oxidizing Substances
  6. Toxic & Infectious Substances
  7. Radioactive Material
  8. Corrosives
  9. Miscellaneous Dangerous Goods


enlogclass1.jpgClass 1 - Explosives

  1. A substance or article with a mass explosion hazard.
  2. A substance or article with a fragment projection hazard, but not a mass explosion hazard.
  3. A substance or article which has a fire hazard along with either a minor blast hazard or a minor projection hazard or both, but not a mass explosion hazard.
  4. A substance or article which presents no significant hazard; explosion effects are largely confined to the package and no projection or fragments of appreciable size or range are to be expected.
  5. A very insensitive substance which nevertheless has a mass explosion hazard like those substances in 1. above
  6. An extremely insensitive article which does not have a mass explosion hazard.  


enlogclass2.jpgClass 2 - Gases

  1. Flammable Gas. Commonly used as fuel (example: propane.
  2. Non-Flammable, Non-Toxic Gas. Commonly used In food refrigeration (example: nitrogen).
  3. Toxic Gas. Commonly used In pulp bleaching. For example: sulphur dioxide.



Class 3 - Flammable Liquids

A Liquid which has a closed-cup flash point not greater than 60o C.  Commonly used as fuel.  For example:  gasoline, ethanol, fuel oil (diesel).


Class 4 - Flammable Solids

class4.jpgFlammable Solids, Substances liable to spontaneous combustion; Substances that on contact with water emit flammable gases (water-reactive substances) 

  1. A solid that under normal conditions of transport is readily combustible, or would cause or contribute to fire through friction or from heat retained from manufacturing or processing, or is a self-reactive substance that is liable to undergo a strongly exothermic reaction, or is a desensitized explosive that is liable to explode if they are not diluted sufficiently to suppress their explosive properties. Commonly used In lacquers. For example: naphthalene.
  2. A substance liable to spontaneous combustion, under normal conditions of transport, or when in contact with air, liable to spontaneous heating to the point where it ignites. Commonly used In rocket fuel. For example: sodium hydrosulphite.
  3. A substance that, on contact with water, emits dangerous quantities of flammable gases or becomes spontaneously combustible on contact with water or water vapour. Commonly used In heat exchangers (valves). For example: sodium.   


classs5.jpgClass 5 - Oxidizing Substances / Organic Peroxides

  1. A substance which causes or contributes to the combustion of other material by yielding oxygen or other oxidizing substances whether or not the substance itself is combustible. Commonly used in fertilizers. For example: ammonium nitrate.
  2. An organic compound that contains the bivalent “- O-O-” structure which is a strong oxidizing agent and may be liable to explosive decomposition, be sensitive to heat, shock or friction, react dangerously with other dangerous goods or may cause damage to the eyes.


class6.jpgClass 6 - Toxic and Infectious Substances

  1. A solid or liquid that is toxic through inhalation, by skin contact or by ingestion. Commonly used as germicide or general disinfectant (example: phenol).
  2. Micro-organisms that are infectious or that are reasonably believed to be infectious to humans or animals. Commonly used In disease research. For example: rabies virus.


Class 7 - Radioactive Substances

class7.jpgSubstances defined as Class 7, Radioactive Materials in the Packaging and Transport of Nuclear Substances Regulations. Commonly used In nuclear fuel rods (example: radioactive material - LSA (yellow cake). There are three categories which indicate the surface radiation level for a package with Category I being the lowest level and Category III the highest.



class8.jpgClass 8 - Corrosive Substances

A substance that causes destruction of skin or corrodes steel or non-clad aluminum. Commonly used In batteries and Industrial cleaners. For example: sulphuric acid and sodium hydroxide.  


class9.jpgClass 9 - Miscellaneous Dangerous Goods

A substance that does not meet the criteria for inclusion in Classes 1 to 8. This includes genetically modified micro-organisms, marine pollutants, elevated temperature materials and environmentally hazardous substances. For example: Dry Ice.