On 16/05/2021 08:21, Jeff Layman wrote:
Why is the turntable made from glass, and not the same metal as the rest
of the microwave oven? Glass is pretty transparent to microwave
frequencies, and the turntable is only a cm or so above the metal floor,
so why not make the turntable from the same metal?

Yes, that. Mine's a steel one. There's a resistive heating element
under, which allows the turntable to be used to make nice pizzas in!