An important note, PPE is the last and least effective line of defense to injury or death from laboratory incidents. Learn about the hierarchy of hazard controls ( https://en.m.wikipedia.org/wiki/Hierarchy_of_hazard_controls) and understand that preventing incidents goes much, much further than PPE alone. https://twitter.com/CMikeMcGuirk/status/1321497131119599618

The incident report from Northwestern has a lot of good information, but it fails to address the root cause of this incident: heating flammable solvents with a heat gun should not be done, regardless of whether you check your flask for integrity, regardless of whether you wear...

PPE, etc. There are other ways to heat solvent in a flask than a heat gun (oil bath, water bath, etc), and doing so would remove this danger and prevent incidents like this from occurring.

I know of at least one nearly identical incident from my time in grad school--a researcher in an adjacent lab was heating solvent in a flask with a heat gun and it ignited. Fortunately in that case there were no serious injuries, but clearly that will not always be the case.