The base of the interior shell of the microwave would be of steel. As long
as the interior surfaces & door mesh & seals are intact, it should operate
as designed. If the outside case is cracked, it won't affect the
performance.

wrote in message
ups.com...
I have a small crack on the floor of my microwave oven. Should I
discontinue use? Will the microwaves be able to escape? Please excuse
my question - when I read it over it sounds dumb but I'd stull like an
answer.

Thanks for the help!