Isn’t this the stuff that the fascists tried to weaonize in WWII, but it was too dangerous to handle and it, like, burnt down a concrete bunker or something?

For reference

It is apparently about the most vigorous fluorinating agent known, and is much more difficult to handle than fluorine gas. That’s one of those statements you don’t get to hear very often, and it should be enough to make any sensible chemist turn around smartly and head down the hall in the other direction.

https://www.science.org/content/blog-post/sand-won-t-save-you-time