Hazmat question
What are the 9 classes of hazmat?
1. Explosives, 2. Gases, 3. Flammable liquids, 4. Flammable solids, 5. Oxidizers & organic peroxides, 6. Toxic & infectious substances, 7. Radioactive material, 8. Corrosives, 9. Miscellaneous hazardous materials. Several classes split further into numbered divisions (like 2.1, 2.2, 2.3).
Answer
1. Explosives, 2. Gases, 3. Flammable liquids, 4. Flammable solids, 5. Oxidizers & organic peroxides, 6. Toxic & infectious substances, 7. Radioactive material, 8. Corrosives, 9. Miscellaneous hazardous materials. Several classes split further into numbered divisions (like 2.1, 2.2, 2.3).
1. Explosives, 2. Gases, 3. Flammable liquids, 4. Flammable solids, 5. Oxidizers & organic peroxides, 6. Toxic & infectious substances, 7. Radioactive material, 8. Corrosives, 9. Miscellaneous hazardous materials. Several classes split further into numbered divisions (like 2.1, 2.2, 2.3).
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This comes up constantly because the class number is what actually appears on placards and shipping papers — people need the plain-English meaning behind the number they're looking at.
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Related
The 9 DOT Hazard Classes, Explained →
Reference basis: 49 CFR Parts 172 and 177, and PHMSA hazmat guidance. Verify current requirements for the specific shipment.