Microwave test for secondary formers?

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Original poster: "Steve Conner by way of Terry Fritz <teslalist-at-qwest-dot-net>" <steve.conner-at-optosci-dot-com>

Dear list,

I was reading an article on constructing your own wireless LAN antenna. It
suggested using the "Microwave test" to choose plastics. Basically you put a
sample of the plastic in your microwave oven and blast it on full power for
a minute or two (with a cup of water to absorb excess energy) If the plastic
stays cold, then it's OK for antenna fittings.

Would the microwave test be a good way of testing secondary former
materials? Or is it possible that a material could be a good dielectric at
2.4GHz but lossy at 200kHz?

Steve C.