Practice question

Under ADR 2.2.1.1.5, what does the term 'deflagration' mean in relation to Class 1 substances?

  1. Instantaneous detonation propagating faster than 5,000 metres per second
  2. Slow evaporation of liquid nitrated esters at room temperature
  3. Spontaneous ignition caused by static electricity discharge
  4. Rapid combustion propagating through a substance at a speed slower than the speed of sound in the material

Answer: D — Rapid combustion propagating through a substance at a speed slower than the speed of sound in the material

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