Re: New 4" coil: R.Hull and CSN, Secondary Varnish

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

Original poster: "Mark Fergerson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mfergerson1-at-cox-dot-net>

Tesla list wrote:
> 
> Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
> 
> Tesla list wrote:
> >
> > Original poster: "Jeff W. Parisse by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <jparisse-at-teslacoil-dot-com>
> 
> > We haven't noticed the "secondary after shock" with the 3M coating
> > either. My hunch is that the rough micro surface of the semi-hard resin
> > is less of a capacitor plate (yes I meant plate) than the glass like
> > surface of hard resin. I'm sure I'm starting a new thread in which I'm
> > not qualified to contribute so I'll just leave it at that.
> 
> All the epoxy resins that I have seen are poor insulators. Maybe
> good enough for Tesla coil insulation, and even advantageous for
> safely draining static charges. Epoxy doesn't retain static
> charges for long (seconds) periods. It can't even be electrized by
> friction. A big no-no for electrostatics.

  So off-the-shelf epoxy would make a
poor electret? (reminiscing the
"mysterious shocks" thread here)

  ISTM we're between a rock (good
insulator = desirable) and a hard place
(good insulators make good electrets);
where's the "middle ground"? Is it
system-specific?

  One poster (I forget who) recommended
"Plumbers Goop" for HV insulation as it
didn't set up hard and appeared to
"self-heal" if it did break down. Is
that the best general-purpose solution
we can hope for?

  Mark L. Fergerson