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Class 2 - Three Divisions

Class 2 dangerous goods are divided into one of three divisions based on their primary hazard.

Division 2.1 is for flammable gases. These gases can ignite when mixed with a certain volume of air (13% or less), or have a flammable range with air, which is determined by tests and calculations. Examples of Division 2.1 flammable gases include hydrogen and acetylene.

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