Lesson 1, Topic 1
In Progress

Packing Groups


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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.

I indicates a high degree of danger

II indicates a medium degree of danger

III indicates a low degree of danger

For example:  Class 3 – Flammable Liquids.

DIETHYL ETHER (ETHYL ETHER) and KEROSENE are both in Class 3 but Diethyl ether is extremely flammable, so it is identified as a Packing Group I substance.  Kerosene is much less flammable and is designated to Packing Group III.