Note that he's primarily taking about HF gas, not the aqueous solution. Aqueous hydrofluoric acid is certainly not to be trifled with but I don't think it's in

Note that he's primarily taking about HF gas, not the aqueous solution. Aqueous hydrofluoric acid is certainly not to be trifled with but I don't think it's in quite the same category as some of the other substances this guy talks about. I used to work in a lab that used large quantities of the stuff and I knew someone who got some on his skin. He went to the hospital but I don't think he suffered any lasting consequences.