Hazardous Materials. HAZMAT Definition (USDOT).
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External ring stiffeners frequently are present on vehicles transporting corrosives or poisons.
Rounded ends on highway transport vehicles suggest presence of pressurized contents.
Dome covers on rail tank cars suggest that the contents are under pressure.
Tank cars with flat ends have been insulated to control product temperature changes.
Explosives: Designed to function with instantaneous release of gas and heat (i.e., by exploding).
Blasting Agents: Designed to explode, but require a blasting cap to trigger the explosion
Poison A: Gases or liquids producing vapors highly hazardous to human health.
Anhydrous Ammonia is classified as a non-flammable gas However, it is flammable and highly toxic!
Chlorine gets its own placard because it is toxic, corrosive, and an oxidizer!
Flammable Liquid: Flash point < 100oF
Combustible Liquid: Flash point > 100oF
Any solid material other than an explosive that is liable to cause fires through friction, through retained heat from manufacturing, or which can be ignited readily and when ignited burns vigorously and persistently.
Liquid oxygen is an oxidizer and a cryogenic agent.
Oxidizers will readily give up oxygen and support combustion.
Organic oxidizers will readily give up oxygen, support combustion, and will burn!
Class B Poisons: Solids and liquids known to be so toxic as to afford a risk to human health or which, in the absence of adequate data are assumed to be toxic to man.
Irritants, substances that give off irritating fumes when heated or exposed to air, are included in Class 6, but are placarded only as DANGEROUS and only if >1000 pounds is present.
Etiologic agents are included in Class 6 but are not placarded.
Vehicles transporting radioactive materials are placarded ONLY if the packages contains material measures >50 millirem/hr on the entire package surface or >3 millirem/hr at 3 feet. (Radioactive III package labeling)
Defense material being moved under authority of the Department of Energy or Department of Defense is NOT placarded.
Materials that attack and destroy living tissue or that produce severe corrosion of steel.
Frequently are also toxic and reactive.
Class C Explosives
Mixed motor vehicle loads of >1000 but <5000 pounds of all HAZMAT except Poison A, Poison B, Solid Dangerous when Wet, Explosive A, Explosive B, and Radioactive
4 = Too dangerous to enter
3 = Extreme danger—Full protective clothing
2 = Hazardous—Breathing apparatus
1 = Slight hazard
0 = No hazard
4 = Extremely flammable
3 = Ignites at normal temperatures
2 = Ignites when moderately heated
1 = Must be preheated to burn
0 = Will not burn