FILAMENT STRENGTH-PROTO-PASTA STAINLESS STEEL

How strong would a full scale iron man helmet be if printed in proto-pasta stainless steel? Would it break if dropped? How much force would be needed in order for it to break? I will print with 3mm walls and 20% infill. Any answer is appreciated. Thanks. Here is helmet: http://www.thingiverse.com/thing:360747