Hazardous Materials Operations Midterm Study
Guide (MFRI) 2025
Hazardous material - Answerany substance or material that is capable of posing an
unreasonable risk to human health, safety, or the environment when transported in
commerce, used incorrectly, or not properly contained/stored
/.Class 1 - Answerexplosives
/.Class 2 - Answergases
/.Class 3 - Answerflammable liquids (and combustible liquids in U.S.)
/.Class 4 - Answerflammable solids, substances liable to spontaneous combustion,
substances which emit flammable gases upon contact with water
/.Class 5 - Answeroxidizing substances and organic peroxides
/.Class 6 - Answertoxic substances and infectious substances
/.Class 7 - Answerradioactive materials
/.Class 8 - Answercorrosive substances
/.Class 9 - Answermiscellaneous dangerous
/.MC-306/DOT 406 - Answernon-pressurized, carries liquid food-grade products,
gasoline, and other flammable and combustible liquids
/.MC-307/DOT-407 - Answerchemical hauler for flammable liquids, mild corrosives, and
poisons
/.MC-312/DOT-412 - Answercorrosives cargo tank, carries sulfuric acid, phosphoric
acid, and sodium hydroxide, has rings around tank
/.MC-331 - Answerpressure cargo tank for ammonium, propane, Freon, and butane
/.MC-338 - Answercryogenic tank
/.Toxic agents - Answersarin, mustard, marked in red
/.Harassing agents - Answertear gas, white phosphorus, marked in yellow
/.Military class 1 orange octagon - Answermass detonation hazards
Guide (MFRI) 2025
Hazardous material - Answerany substance or material that is capable of posing an
unreasonable risk to human health, safety, or the environment when transported in
commerce, used incorrectly, or not properly contained/stored
/.Class 1 - Answerexplosives
/.Class 2 - Answergases
/.Class 3 - Answerflammable liquids (and combustible liquids in U.S.)
/.Class 4 - Answerflammable solids, substances liable to spontaneous combustion,
substances which emit flammable gases upon contact with water
/.Class 5 - Answeroxidizing substances and organic peroxides
/.Class 6 - Answertoxic substances and infectious substances
/.Class 7 - Answerradioactive materials
/.Class 8 - Answercorrosive substances
/.Class 9 - Answermiscellaneous dangerous
/.MC-306/DOT 406 - Answernon-pressurized, carries liquid food-grade products,
gasoline, and other flammable and combustible liquids
/.MC-307/DOT-407 - Answerchemical hauler for flammable liquids, mild corrosives, and
poisons
/.MC-312/DOT-412 - Answercorrosives cargo tank, carries sulfuric acid, phosphoric
acid, and sodium hydroxide, has rings around tank
/.MC-331 - Answerpressure cargo tank for ammonium, propane, Freon, and butane
/.MC-338 - Answercryogenic tank
/.Toxic agents - Answersarin, mustard, marked in red
/.Harassing agents - Answertear gas, white phosphorus, marked in yellow
/.Military class 1 orange octagon - Answermass detonation hazards
