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• Microwaves do not flow down wires, but are guided through a metal duct from the megatron into the microwave oven cavity. To prevent foreign objects from entering the waveguide, a cover needs to be fitted. This has to be transparent to the microwaves but also strong enough to prevent it collapsing under use. A wave guide is made up of mica layers By microspares - Hampshire - 25 August 2009