3
Explosives that have no explosive hazard are not explosives. Materials that have a fire hazard but no explosive hazard are Class 2 if they are gasses, class 3 if they are liquids, and class 4 if they are solids.
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Hazard Class 3
Class 1 materials are explosives.Materials that have an explosive hazard are in Hazard Class 1.
In the realm of hazardous locations Class 1 refers to an environment containing flammable or explosive vapors or gases and Division 2 is a location where those gases are expected to be present only during an upset condition.
DOT class 8 are corrosive.
Hazard Class 2 is for compressed gases and poisonous gases.
Division 1.1: Explosives with a mass explosion hazard Division 1.2: Explosives with a projection hazard Division 1.3: Explosives with predominately a fire hazard Division 1.4: Explosives with no significant blast hazard Division 1.5: Very insensitive explosives; blasting agents Division 1.6: Extremely insensitive detonating substances
Corrosive materials are in Hazard Class 8.
Hazard class 4 is Flammable Solids.
Although both can, explosive material represents a projection hazard by producing shrapnel on impact with a hard object. So, if launching explosive material, be careful. wouldn't want shrapnel to cut into your body!