What is a common characteristic of Class 2 materials?

Class 2 materials are specifically categorized as gases, which are classified based on their physical state when transported. The defining characteristic of this class is that they are compressed gases, which can be flammable, non-flammable, or toxic, depending on their specific properties.

In this context, compressed gases can exist in various forms, including those that are harmful or pose risks to safety and health upon release into the environment. Thus, recognizing that Class 2 materials are fundamentally linked to their gaseous nature helps to understand their behavior during transportation and the necessary precautions that must be taken.

The other classifications mentioned do apply to certain hazardous materials but do not define Class 2 on their own. For example, corrosive materials, explosives, and toxic substances are covered under different classes (Class 8, Class 1, and Class 6, respectively). Consequently, identifying Class 2 materials strictly as compressed gases emphasizes their unique characteristics and the specific regulatory requirements associated with their handling and transport.