Re: Useing silicone encapsulants for HV

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

Original poster: "Jolyon Vater Cox by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>

It is best to avoid the common "acetic cure" bathtub caulk silicone sold by
ironmongers for household purposes. This -stuff which smells like vinegar
because it exudes acetic acid as it cures- is much too corrosive  to be
useful in electrical or electronic applications.

Jolyon.

Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, April 03, 2003 1:21 AM
Subject: Re: Useing silicone encapsulants for HV


 > Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<jimlux-at-earthlink-dot-net>
 >
 > At 11:46 AM 4/2/2003 -0700, you wrote:
 > >Original poster: "Mike Harrison by way of Terry Fritz
 > ><teslalist-at-qwest-dot-net>" <mike-at-whitewing.co.uk>
 > >
 > >I'm planning my next Marx generator, and am thinking of using 2-part
clear
 > >silicone encapsulant to
 > >insulate much of it to avoid corona loss.
 > >The plan is to use  folded 3mm thick actrylic section as the main
upright,
 > >with two 'V' sections,
 > >which will be filled with encapsulant,forming a triangular potted
section.
 > >This will cover the charge resistor chain and the ends of the caps.
 > >
 > >Anyone have any good/bad experience with this stuff ?
 > >Any pointers to UK suppliers would be appreciated - the only one I can
 > >find at the moment is RS, and
 > >their price is UKP30 (~US$50) for 450g, which seems rather a lot....
 > >
 > >I'm assuming silicone is th etype to go for, as I want it reasonably
 > >clear, and flexible enough to
 > >avoid cracking.
 >
 >
 > That's not an unusual price for water clear two part silicone.  I think I
 > paid ( a few years back) on the order of $30 for a "1 pint kit" (actually
a
 > pint each of part A and Part B, to be mixed 1:1) at my local plastics/foam
 > dealer (Sil-Foam).  The stuff seems cheap when you buy it in little 4 oz
 > tubes for caulking.
 >
 >
 >
 >
 >