Re: circuit board caps

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

You want to be careful about dielectric strengths for thin films.  Oddly,
the kV/cm number gets bigger for thinner layers (that is, a piece 1 mm thick
might have a breakdown strength of 70 kV, but a piece 10 mm thick might have
a breakdown of only 350 kV).

There is also HUGE variability on dielectric strength, depending on
inclusions, contaminants, moisture content, surface finish, testing method,
etc.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, September 29, 2001 11:27 AM
Subject: Re: circuit board caps


> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Hollmike-at-aol-dot-com>
>
> Janet,
>    You can find much of that information here:
>
> http://www.matweb-dot-com/searchindex.htm
>
> Just look in the thermoplastics section.  This is a pretty extensive
database
> for just about everything actually.  PTFE has a dielectric constant of
appros.
> 2.1 and dielectric strength of about 70kV/mm.
> Mike
>
>
>