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Re: Homemade stacked plate cap. *Need* a vacuum pump?
From: Alfred A. Skrocki[SMTP:alfred.skrocki-at-cybernetworking-dot-com]
Sent: Thursday, November 06, 1997 8:43 AM
To: Tesla List
Subject: Re: Homemade stacked plate cap. *Need* a vacuum pump?
On Monday, November 03, 1997 10:59 AM Jim Lux
[SMTP:jimlux-at-earthlink-dot-net] WROTE:
> Polyethylene typically has a higher breakdown strength than acrylic
> (Plexiglas) (800-1000 V/mil vs 300-400 V/mil).
I've never seen polyethelene film tollerate more than around 400 V/mil.
and several plastics manufacturers claim that plexiglass
(methylmethacrolate) will tolerate upwards to 900V/mil.
> Also Plexiglas is very lossy.
That is the hitch I was suspecting, far too many times when I've
used plexiglas on R.F. coil forms only to watch them soften and
sag, implying to me that the plexiglas is absorbing too much R.F.
> Plexi does have good mechanical properties as does polycarbonate
> (Lexan), which makes it handy for structural uses. And, not the
> least, you can glue plexi or polycarbonate, but nothing glues PE.
There is a bit of a trick to glueing polyethylene, it is done by
'alloying' it with paraffin wax. Tricky and a bit messy but it does
work.
Sincerely
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Alfred A. Skrocki
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