This comes up every few months.

It can withstand flash temperatures that high but nothing more sustained than a few thousandths of a second unless this guy somehow broke physics. What I mean by that is that the types of bonds found in any type of plastic simply cannot withstand that kind of energy, in fact no known material can.

Also it has to be fairly brittle based on the few demonstration videos of it where they coat an egg with it, torch it, then remove it in under a minute. It's not a hoax but it isn't a miracle material either, the creator was just very good at marketing it and had total message control over what he could claim about it.