Which class of hazardous materials includes explosives?

• A. Class 2
• B. Class 1
• C. Class 3
• D. Class 4

Answer: (B)

The class of hazardous materials that includes explosives is Class 1. This classification encompasses a variety of explosive substances and articles, which are defined as materials that may undergo a rapid chemical reaction resulting in an explosion. Class 1 is further divided into divisions based on the specific types and characteristics of the explosives, such as those that are less sensitive compared to more sensitive materials that can cause greater hazards.

Class 2 primarily includes gases, which are flammable or non-flammable but do not fall under the explosive category. Class 3 consists of flammable liquids, while Class 4 includes flammable solids and materials that may be spontaneously combustible. Therefore, while each of these classes represents dangerous materials, only Class 1 specifically addresses explosive substances.