Re: ULTEM cap dielectric

["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>

Ultem is a high molecular weight PE, in my recollection.

Bear in mind that the breakdown field strength of most plastics is somewhat
dependent on the film thickness.  Very thin films have high breakdown
strengths in a V/m sense, compared to bulk material.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, October 29, 2002 6:22 AM
Subject: ULTEM cap dielectric


 > Original poster: "Harold Weiss by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<hweiss-at-new.rr-dot-com>
 >
 > Hello all,
 >
 > In the Handbook of Chemistry and Physics, I found a chart on breakdown
 > voltages for various materials.  Ultem had a breakdown voltage of
 > 400-500KV/mm, second place went to Kapton at about 375-450KV/mm. This is
 > from memory, so the ranges may be a little off, but they were in the
 > vicinity that I list.  Ultem is a GE plastic.  GE does make a film listed
 > as ULTEM 1000.  I do not have all the details yet on this material.  If
 > this material has low RF losses, this stuff could make excellent high
 > voltage pulse caps.
 >
 > David E Weiss
 >
 >