Re: circuit board caps

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Crow Leader by way of Terry Fritz <twftesla-at-qwest-dot-net>" <presence-at-churchofinformationwarfare-dot-org>

All these specs depend on how the PTFE was prepared and made into a film or
sheet. There are a few techniques. I'll try to find them for everybody and
the differences in electrical properties if I can.

KEN
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, September 29, 2001 1:19 PM
Subject: RE: circuit board caps


> Original poster: "Chris Sartler by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <Chris.Sartler-at-adicon-dot-com>
>
> Polytetrafluoroethylene:
>
> Electrical Resistivity, Ohm-cm
>  1E+18
>  ASTM D257
>  1E+18 Ohm-cm
> Dielectric Constant
>  2.1
>  ASTM D150; 60 Hz to 2 GHz
>  2.1
> Dielectric Constant, Low Frequency
>  2.1
>  ASTM D 150; 60 Hz to 2 GHz
>  2.1
> Dielectric Strength, kV/mm
>  60
>  ASTM D149
>  1,524 kV/in
> Dissipation Factor
>  0.0003
>  Lower Limit; ASTM D 150; 60 Hz to 2 GHz
>  0.0003
> Dissipation Factor, Low Frequency
>  0.0003
>  Lower Limit; ASTM D 150; 60 Hz to 2 GHz
>  0.0003
>
> This assumes pure/virgin substance. Typically CB material will olny have a
> resistance of 1E+15 Ohms/cm and as it is poluted the dielectric strength
> goes down also.  Also note the Dielectric constant is olny 2.1, so you
will
> need more plates than with say Vinyl or Polyethelene ---> C= e(A/d)
>
> ,
> Chris
>
>
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Friday, September 28, 2001 4:05 PM
> To: tesla-at-pupman-dot-com
> Subject: circuit board caps
>
>
> Original poster: "Janet Johnson by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
> <jpjmassage-at-earthlink-dot-net>
>
> Hi,
> Does anyone have an idea of what the dielectric breakdown voltage of PTFE
or
> other circuit board materials might be?  I asked a question about this a
> while
> ago and then didn't consider it much further but we have a bunch of 10 to
30
> mil thick, 2x3 foot sheets of sample material at work that we haven't used
> for
> years.  If the dielectric could handle the voltage I think it would make a
> viable tank cap.  You'd probably still want to encase it in oil and remove
> the
> air though.  BTW how could you make a good vacuum seal?  Thanks for any
> ideas...
>
> JJ - SLC
>
>
>
>
>