[SI-LIST] Dielectric Constant regards Insulator/Air combination

Hi,

I'm looking for a formula that will give the "dielectric constant" of an
insulator, that has had a percentage of the insulator replaced by air,
to lower the er. 

That is: I have a flat piece of polyethylene of "known" dimensions, and
"dielectric constant". I've precisely drilled hundreds of holes in it.
So I know what the ratio of "polyethylene to air" is, per unit square. 

The principles of doing this is described in a lot of places. However, I
can't seem to find a formulae that describes how to determine how much
the "dielectric constant" has changed.

Can anyone refer me to a formula?

Thanks

Peter Baxter
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