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The bulk of the material used to make a microwave is steel, and not thermosetting plastic. The cavity (the cooking space) is a metal "cave" with a door on it. There will be some components in an oven that are made of thermosetting plastic, but the bulk of the construction material is mild steel. Steel "seals in" microwave energy. Microwaves can pass through most thermosetting plastic. And that would be bad.

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13y ago
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8y ago

My computer case (which is pretty typical) is made primarily of metal/ I'm nearly positive the face plate is thermoplastic (not the same thing), but I don't want to try melting it to see.

It would be possible to make a case from a thermoset plastic, but offhand I can't recall ever having seen one.

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Q: Is a microwave made out of thermosetting plastic?
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