There are _____ hazard classes.

There are _____ hazard classes.

• A. 7
• B. 9
• C. 11
• D. 5

Answer: (B)

Understanding how hazardous materials are categorized helps you know how they must be labeled, packed, and transported. There are nine hazard classes defined for hazardous materials under the regulations. These cover Explosives; Gases; Flammable Liquids; Flammable Solids; Oxidizers and Organic Peroxides (as part of Class 5); Toxic Substances and Infectious Substances (as part of Class 6); Radioactive Materials; Corrosive Substances; and Miscellaneous Hazardous Materials. Some materials carry multiple hazards, but they’re assigned to one primary class for shipping purposes with any additional hazards noted as needed. That’s why the correct total is nine. The other numbers don’t align with the standard regulatory classification.

Understanding how hazardous materials are categorized helps you know how they must be labeled, packed, and transported. There are nine hazard classes defined for hazardous materials under the regulations. These cover Explosives; Gases; Flammable Liquids; Flammable Solids; Oxidizers and Organic Peroxides (as part of Class 5); Toxic Substances and Infectious Substances (as part of Class 6); Radioactive Materials; Corrosive Substances; and Miscellaneous Hazardous Materials. Some materials carry multiple hazards, but they’re assigned to one primary class for shipping purposes with any additional hazards noted as needed. That’s why the correct total is nine. The other numbers don’t align with the standard regulatory classification.