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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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14y ago

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