CDL Hazardous Materials Practice Test

The floor liner for explosives should not contain steel or iron because these materials can create a spark when they come into contact with certain explosive substances. This spark can ignite the explosives or cause a significant reaction, leading to an explosion. The use of non-sparking materials is crucial in environments where explosives or flammable materials are present.

Rubber, plastic, and wood, while they may have their own risks, do not pose the same ignition hazard due to sparking as metals like steel or iron. Therefore, it is essential to choose materials for floor liners that minimize the risk of accidental ignition, ensuring a safer environment for the handling and transportation of explosives.