Amos, I presume anything is capable of burning at high enough temperature (your caveat aside) means we can ignore the one Liz omitted

nonflammable

My smartypants remarks aside, it is precisely such confusion that has caused most who have to deal with hazardous substances (some of which may burn in the context of normal use) to limit modern warning signs to read either "flammable" or "nonflammable".

Cheers, Rowan