How many hazard classes are defined by the DOT?

How many hazard classes are defined by the DOT?

• A. 6
• B. 9
• C. 12
• D. 15

Answer: (B)

Understanding DOT hazard classifications starts with recognizing that there are nine hazard classes defined in 49 CFR. These classes cover Explosives; Gases; Flammable liquids; Flammable solids, spontaneously combustible materials, and those hazardous when wet (the 4th class and its divisions); Oxidizers and Organic peroxides (the 5th class); Toxic substances and Infectious substances (the 6th class); Radioactive materials (the 7th class); Corrosive materials (the 8th class); and Miscellaneous hazardous materials (the 9th class). This framework standardizes how hazardous materials are labeled, packaged, and handled during shipping. So, the DOT specifies nine hazard classes.

Understanding DOT hazard classifications starts with recognizing that there are nine hazard classes defined in 49 CFR. These classes cover Explosives; Gases; Flammable liquids; Flammable solids, spontaneously combustible materials, and those hazardous when wet (the 4th class and its divisions); Oxidizers and Organic peroxides (the 5th class); Toxic substances and Infectious substances (the 6th class); Radioactive materials (the 7th class); Corrosive materials (the 8th class); and Miscellaneous hazardous materials (the 9th class). This framework standardizes how hazardous materials are labeled, packaged, and handled during shipping. So, the DOT specifies nine hazard classes.