MLA Citation: Bloomfield, Louis A. "Question 1517"
How Everything Works 13 Dec 2017. 13 Dec 2017 <http://howeverythingworks.org/print1.php?QNum=1517>.
1517. I recently bought a used microwave oven. The enamel coating under the glass turntable tray is rusted in a ring around the track that the turntable rotates on. Should I repair this or is it ok to just use it as is? — AA, Kettering, Ohio
As long as the oven's metal bottom is sound underneath the rust, there isn't a problem. The cooking chamber walls are so thick and highly conducting that they reflect the microwaves extremely well even when they have a little rust on them. However, if the metal is so rusted that it loses most of its conductivity in the rust sites, you'll get local heating across the rusty patches and eventually leakage of microwaves. If you're really concerned that there may be trouble, run the microwave oven empty for about 20 seconds and then (carefully!) touch the rusty spots. If they aren't hot, then the metal underneath is doing its job just fine.

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