There are _____ hazard classes.

There are _____ hazard classes.

• A. 9
• B. 7
• C. 11
• D. 5

Answer: (A)

Understanding how hazardous materials are categorized helps you know how to label, package, and handle them safely. There are nine hazard classes in the DOT/PHMSA system. They cover Explosives; Gases; Flammable liquids; Flammable solids, water-reactive and spontaneously combusting solids; Oxidizers and organic peroxides; Toxic and infectious substances; Radioactive materials; Corrosives; and Miscellaneous dangerous goods. Some materials can have more than one hazard on a shipping paper, but their primary class is one of these nine. This is why the correct count is nine, not five, seven, or eleven.

Understanding how hazardous materials are categorized helps you know how to label, package, and handle them safely. There are nine hazard classes in the DOT/PHMSA system. They cover Explosives; Gases; Flammable liquids; Flammable solids, water-reactive and spontaneously combusting solids; Oxidizers and organic peroxides; Toxic and infectious substances; Radioactive materials; Corrosives; and Miscellaneous dangerous goods. Some materials can have more than one hazard on a shipping paper, but their primary class is one of these nine. This is why the correct count is nine, not five, seven, or eleven.