Metal in Microwave Ovens?

[Phidom]

I was returning a combi oven to a customer yesterday and he asked a question I was unable to answer. The Sharp machine has a glass turntable with a wire stand to raise items closer to the grill. The microwave works OK with this metal stand in situ with no sparking etc. He asked me why this metal was OK whereas a tiny bit of foil lid still attached to a ready meal tub will cause sparks? Does anyone know?

[kwatt]

Re: Metal in Microwave Ovens?

Wikipedia wrote:It is possible for metal objects to be microwave-oven compatible, although experimentation by users is not encouraged. Microwaving an individual smooth metal object without pointed ends, for example, a spoon or shallow metal pan, usually does not produce sparking. Thick metal wire racks can be part of the interior design in microwave ovens. In a similar way, the interior wall plates with perforating holes which allow light and air into the oven, and allow interior-viewing through the oven door, are all made of conductive metal formed in a safe shape.

🙂

K.

[bigchrisoioi]

its because it is insulated to plastic or glass….i’e if you have a jacket potato wrapped in foil, the microwaves will excite the molicules in the water next to the foil causing a reaction…however, wire racks next to plactic liner have no molical reaction…..water and glass asorb microwaves, metal reflect………..wierd these magnatrons!!!

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