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  • Classes are expressed by single digit numbers. Each of the nine classes are (Part 2 TDGR):
    o Class 1 – Explosives
    o Class 2 – Gases
    o Class 3 – Flammable Liquids
    o Class 4 – Flammable Solids; Substances Liable to Spontaneous Combustion; Substances Which, in Contact with Water, Emit Flammable Gases
    o Class 5 – Oxidizing substances and Organic Peroxide
    o Class 6 – Toxic and Infectious Substances
    o Class 7 – Radioactive Material
    o Class 8 – Corrosives Class 9 – Miscellaneous Dangerous Goods
  • Note: The order of the Classes does not indicate the relative danger presented
  • Some of the classes of dangerous goods are further separated into “Divisions”
  • The number preceding the point refers to the class and the number following the point refers to the division
  • Most of the classes are further broken down into “Packing Groups.” These are indicted using Roman Numerals and relate to the degree of danger present
    o I indicates a high degree of danger
    o II indicates a medium degree of danger
    o III indicates a low degree of danger
  • Some dangerous goods offer more than one hazard. Therefore, they can meet the criteria of more than one class
    o The “Primary” classification is always indicated first and is then followed by the “Subsidiary” class or classes
  • When dangerous goods are combined with non-dangerous goods, it can affect the classification of the substance
    o If a product is mixed with a non-dangerous good and still meets the criteria for that substance, a shipping name with the word “mixture” or “solution” may be used
    o If the addition of the non-dangerous good is sufficient enough to prevent the substance from meeting any of the classification criteria, it is no lounger subject to the regulations
  • oIf a product is mixed with a non-dangerous good and still meets the criteria for that substance, a shipping name with the word “mixture” or “solution” may be used
  • oIf the addition of the non-dangerous good is sufficient enough to prevent the substance from meeting any of the classification criteria, it is no lounger subject to the regulations

Just as each class has its own number and in some cases divisions, they also have their own combination of corresponding colours and symbols to visually indicate the type of danger present. This is displayed using hazard labels like the following: