Why do you need the UN number and Packing Group as well as the Hazard Class?

  • The Class identifies the general type of hazard e.g. Class 2 Gases. The subclass identifies the specific type of hazardous goods within that class e.g. 2.1 Flammable gases.
  • The UN number identifies the actual hazardous substances, e.g. UN2014 Hydrogen Peroxide.
  • Packing group numbers 1,2 and 3 are used to identify the different degree of danger that some substances with the same name will have dependant for example on their Flash Point, i.e. the point at which they will combust.

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