How about some kind of AIR insulator? It'd really help with bunkers and stuff maybe it could be destroyed with heat and be immune to air? I don't know if it's possible but if it is please reply :D and it might be called airinsl or ainsl :)
Immune to pressure?(Which is air...) Well there may be another element that already does this...(I dont know though but anyone feel free to prove me wrong.) But its a good idea. But others may disagree...