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I need to build special equipment for a microwave oven ( 2.45 (GHz)). But even glass and plastics do heat up in microwave ovens. Where can I find a list of the materials that are the most transparent to this frequency ?

Thanks

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    $\begingroup$ Have you tried borosilicate glass (not normal glass)? How do you account for secondary heating effects? $\endgroup$ – joojaa Jun 22 at 10:23
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    $\begingroup$ Could you give us more information about how you are using the material in your design so we can narrow down the possibilities for you ? There are many materials which have a suitable dielectric loss factor that you can use. $\endgroup$ – William Hird Jun 22 at 21:35
  • $\begingroup$ I am building a vacuum microwave dehydrator. When the food is nearly dry, the glass bowl containing the food (and plastic fittings) heat up a lot defeating the purpose of dehydrating under vacuum/low temp. $\endgroup$ – Manu de Hanoi Jun 23 at 11:19
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    $\begingroup$ You can use Teflon, although not cheap , it has a dielectric loss rating of .0002 @ 3GHZ, will not absorb moisture , and has little or no chemical reaction with any food. $\endgroup$ – William Hird Jun 24 at 17:44
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    $\begingroup$ @ManudeHanoi: You can Google the electrical characteristics of just about any material. $\endgroup$ – William Hird Jun 25 at 17:33

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