Corrected entry: Dr.Doom picked his mask from some sort of store. Thus, it was unlikely to be made of titanium or some other heat resistant alloy. The heat generated by the fire during the final battle is big enough to melt Dr.Doom himself, yet the mask is intact. It should have melted first.
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Correction: The mask was actually shown to be a gift from his home country of Latveria. It can be seen in his home earlier in the movie and you can see the plaque on it when he smashes the case to get it out. So there is really no saying what the metal was, that the mask was made out of. And since Doom didn't actually melt in the final battle - it actually seems to solidfy the alloy that has taken over his body (and as evidenced by the play with electricity in the cargo hold, showing that there is still life in him). It seems entirely probable that the mask could survive as well.
wolfchild