The main hazard of products carried in DOT 412/312 tankers is:

• A. Chemical burns
• B. Thermal burns
• C. Explosion risk
• D. Chemical inhalation only

Answer: (C)

The primary danger with products carried in these cargo tanks is the explosion risk. These tankers transport highly volatile, flammable liquids. When a leak occurs, the liquid can vaporize and form a flammable vapour–air mixture. If an ignition source is present, that mixture can ignite and cause a rapid, large explosion. This threat often supersedes other hazards like skin contact or inhalation, because a vapour cloud ignition can be catastrophic and involve the whole scene. In some scenarios, heating the cargo can also lead to a BLEVE (a violent rupture of the tank), further underscoring why explosion risk is the main concern with these tankers.