By utilizing these characteristics, it can be noted that most (if not all) laboratory chemicals will be considered hazardous, whether they are classified through the listed or characteristic methods. For an inexperienced or untrained person, the complexity of characterization increases the possibility of dangerous scenarios.
One example of a dangerous scenario would be an inexperienced person not knowing that acids and bases should not be stored nor packed in the same container, due to their thermal and violent reactions when interacting. Some more complex, but still plausible examples of dangers that can arise during lab-packs include the following:
The laboratory manager of a closing pharmaceutical startup decides to lab-pack their own drums before disposal, in hopes of lowering the overall cost. Towards the end of the lab-pack, the lab manager notices a glass bottle of table salt (NaCl) sitting in the corner of one of the shelves. Since they think of NaCl as innocuous, they decide to place it in one of the remaining open drums containing 2L bottles of sulfuric acid (H2SO4). They close the drums, label them, prepare the paperwork, and coordinate with a transportation company for pickup.
During transport, the driver hits a tall speed bump, causing the bottles to jostle and crack each other open. As the sulfuric acid reacts with the table salt, it creates hydrochloric acid gas which fills up the drum. The pressure causes the drum to rupture, spewing hydrogen chloride (HCl) gas and sulfuric acid (H2SO4) into the trailer, harming the driver once he opens the doors to unload the waste.