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In Reply to: dielectric constant posted by Cura on March 25, 2007 at 06:39:05:
The 1.3-1.4 figure for cotton is rather misleading unless you're going to make your cables by simply stringing the wires through cotton balls. In textile form, the figure is rather higher due to there being much less air for a given volume compared to cotton in its raw form.se
Follow Ups:
That gives a much higher number for DC.
That gives a much higher number for DC.
Yes, thanks. I recall your posting that link on some other forum not long ago.
se
that it was a posting of yours I saw (not on AA) that caused me research to subject a little more. So actually thank you.
that it was a posting of yours I saw (not on AA) that caused me research to subject a little more. So actually thank you.
Ah. Well, you're welcome. :)
se
another example of what your saying is... kraft paper... which may be listed generically as having a dielectric constant of say approx 2.5.
But this really depends on how much calendaring the kraft paper has had done to it--- calendar it a lot and you decrease the amount of air captured in the paper and the constant goes up. Also--- keep in mind that if the material in question is relatively "porous" and it is going to be impregnated then the dielectric qualities of the impgrenant are perhaps dominant.Another excellent example of this phenomenon is Goretex... which is from the teflon family--- and depending on which GT your talking about--- has dielectric constants as low as say 1.3--- but largely from injecting a lot of air into the teflon--- making it a not very good mechanical platform.
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