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Subject: Re: FR-4 and HV
Date: Tue, 17 Sep 2002 23:29:29 -0700
Organization: SCN Research of Tigard, Oregon, USA.
NNTP-Posting-Date: Wed, 18 Sep 2002 06:29:34 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
I would hope to have the FR-4 fiberglass/epoxy laminate (typical printed
circuit board material) thick enough that
the electric field was at a density low enough to prevent
ozone producing corona in the first place. That part is
quite easy to figure out. I can alter the electric field density quite
easily, I just need to know what a safe level would be.
However, I have seen various vague references, specifically in regards to
military and space high-rel
HV power supplies which reference degradation of the
FR-4/G-10 materials internally due to long term exposure to stong electric
Hoping one of the experts here might shed a little light.
Thanks in advance!
"Mark Thorson" wrote in message
> Leeper wrote:
> > I'd like to find some information on the web for understanding the long
> > effects of the degradation of FR-4 to high strength electrical fields
> > recommendations on the usage of FR-4 for long term HV insulation and the
> > maximum
> > recommended field strength/density for long term reliability.
> Wouldn't this be expressed in terms of ozone exposure?
> Why would an electric field _per_se_ have any effect on FR4?
> Wouldn't any degradation of the plastic be caused by ozone
> created by corona discharge?
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