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8. WHMIS and the Transportation of Dangerous Goods: A Comparison

  • ISBN: 978-1-4249-6996-8
  • Revised: August 2008
  • Content last reviewed: June 2009

This guideline is being updated to reflect changes that take effect July 1, 2016 as amendments to the WHMIS regulation, Regulation 860, come into force.

WHMIS and TDG Classification Systems

The classification of products under WHMIS and TDG is similar but not identical. WHMIS has 6 Classes, designated A to F and TDG has 9 Classes, designated 1 to 9. WHMIS Classes A to E have comparable Classes in TDG, but Class F has no equivalent in TDG. On the other hand, TDG has 2 Classes that have no equivalent in WHMIS, namely, Class 1, Explosives and Class 7, Radioactive Materials. An overview of the classes used in the two systems is shown in Table 1.

Table 1. An Overview of the Classes used in the WHMIS and TDG Systems
Workplace Hazardous Materials Information System (WHMIS) Transportation of Dangerous Goods (TDG)
Class A Compressed Gases

Class 1 Explosives

Divisions 1-5 differentiated on the basis of hazard

Class 2 Compressed Gases

Division 1: Flammable Gases
Division 2: Non-flammable, Non-toxic, Non-corrosive Gases
Division 3: Poisonous Gases
Division 4: Corrosive Gases

Class B Flammable and Combustible Material

Division 1: Flammable Gases
Division 2: Flammable Liquids
Division 3: Combustible Liquids
Division 4: Flammable Solids
Division 5: Flammable Aerosols
Division 6: Reactive Flammable Materials

Class 3 Flammable Liquids

Divisions 1-3 differentiated on the basis of flashpoint and form of transport

Class 4 Flammable Solids, Spontaneously Combustible, Dangerous When Wet

Division 1: Flammable Solids
Division 2: Substances Liable to Spontaneous Combustion
Division 3: Substances Which Emit Flammable Gases on Contact with Water
Class C Oxidizing Material

Class 5 Oxidizing Substances and Organic Peroxides

Division 1: Oxidizing Substances
Division 2: Organic Peroxides

Class D Poisonous and Infectious Material

Division 1: Materials Causing Immediate and Serious Toxic Effect
Division 2: Materials Causing Other Toxic Effects
Division 3: Biohazardous Infectious Material

Class 6 Poisonous and Infectious Substances

Division 1: Poisonous Substances
Division 2: Infectious Substances

Class 7 Radioactive Materials

Class E Corrosive Material Class 8 Corrosives
Class F Dangerously Reactive Material

Class 9 Miscellaneous Products or Substances

Division 1: Miscellaneous Dangerous Goods
Division 2: Environmentally Hazardous Substances
Division 3: Dangerous Wastes

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