From his out-of-print classic Ignition! we have: I’ll let the late John Clark describe the stuff, since he had first-hand experience in attempts to use it as rocket fuel. That process, I should add, would necessarily have been accompanied by copious amounts of horribly toxic and corrosive by-products: it’s bad enough when your reagent ignites wet sand, but the clouds of hot hydrofluoric acid are your special door prize if you’re foolhardy enough to hang around and watch the fireworks. It burned its way through a foot of concrete floor and chewed up another meter of sand and gravel beneath, completing a day that I'm sure no one involved ever forgot. There’s a report from the early 1950s (in this PDF) of a one-ton spill of the stuff. It’s been used in the semiconductor industry to clean oxides off of surfaces, at which activity it no doubt excels. That means that it can potentially go on to “burn” things that you would normally consider already burnt to hell and gone, and a practical consequence of that is that it’ll start roaring reactions with things like bricks and asbestos tile. The compound also a stronger oxidizing agent than oxygen itself, which also puts it into rare territory. 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. It is apparently about the most vigorous fluorinating agent known, and is much more difficult to handle than fluorine gas. Let's put it this way: during World War II, the Germans were very interested in using it in self-igniting flamethrowers, but found it too nasty to work with. I have not encountered this fine substance myself, but reading up on its properties immediately gives it a spot on my “no way, no how” list. Thanks to a note from reader Robert L., I can report that there is indeed such a reagent: chlorine trifluoride. In a comment to my post on putting out fires last week, one commenter mentioned the utility of the good old sand bucket, and wondered if there was anything that would go on to set the sand on fire.
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