"Non-flammable compressed gas" is the formal terminology. This class/division includes carbon dioxide (co2) cylinders, air tanks, and many industrial gasses described as "inert". Flammable gasses/aerosols, and toxic gasses/aerosols are also in class 2, but different divisions (2.1, and 2.3 respectively)
Class 2 division 2, more properly called Division 2.2, is for nonflammable compressed gas such as Argon gas or liquefied gas such as liquid carbon dioxide.
DOT Class 2 consists of
Division 1 - Flammable gas
Division 2 - Non-flammable compressed gas
Division 3 - Poisonous gas
DOT Class 2 is for gasses of various types.
Division 2.1 is flammable gases; Division 2.2 is nonflammable compressed gasses; Division 2.3 is poisonous gasses.
DOT Class 4 Division 2 is more properly called Division 4.2 and is for spontaneously combustible material.
liquefied gas
liquified gas
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Liquefied Gas
There is no Class 3 Division 2; Class three has no subdivisions.
Division 2.3 is for poisonous gases.
DOT Class 3 is for flammable liquids, but there is no subdivision of the class so there is no division 3 for this class.
DOT Class 2, Division 1 (more properly called Division 2.1) is for flammable gases.
DOT Class 2, Division 1 (more properly called Division 2.1) is for flammable gases.
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Division 2.3 is for poisonous gases.
Class 6, Division 2 (more properly called Division 6.2) is for infectious agents.
DOT division 2.2 is for compressed nonflammable gasses.
Materials NOT found in Class 2 would be any material that is not a gas.
What type of hazard does hazard class 1, division 2 material present