Re: Potting on the Cheap (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 8 Sep 2003 09:21:14 +1200
From: Malcolm Watts <m.j.watts@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Potting on the Cheap (fwd)

Hi Colin,

On 7 Sep 2003, at 14:06, High Voltage list wrote:

> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Sun, 7 Sep 2003 09:26:06 +0100
> From: colin.heath4 <colin.heath4@xxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: Potting on the Cheap (fwd)
>
> hi matthew,
>                     the problem with that silicone is its acidic and will
> corrode the joints. candle wax is fine if melted then poured over slowly.
> but then it is fragile one slight bend and it doesnt work any more.
> i would go for melted vaseline poured over slow as not to cause air bubbles.
> then once it sets you have a flexible high voltage potting compound.
> cheers
> colin

You can get "neutral-cure" silicone which doesn't give off acetic
acid fumes. The problem with those things really is that they take an
age to set if they aren't exposed to air.

Malcolm

> ----- Original Message -----
> From: High Voltage list <hvlist@xxxxxxxxxx>
> To: <hvlist@xxxxxxxxxx>
> Sent: Sunday, September 07, 2003 4:10 AM
> Subject: Potting on the Cheap (fwd)
>
>
> > Original poster: Steven Roys <sroys@xxxxxxxx>
> >
> >
> >
> > ---------- Forwarded message ----------
> > Date: Sat, 06 Sep 2003 16:37:53 +0930
> > From: Matthew Smith <matt@xxxxxxxxxx>
> > To: High Voltage list <hvlist@xxxxxxxxxx>
> > Subject: Potting on the Cheap
> >
> > Hi All
> >
> > I have recently acquired some (very cheap) SMD equivalent devices to the
> > 1N4007.  I'm going to use these to make HV rectifier strings on narrow
> > PCBs - no drilling ;-)
> >
> > Construction is simpler than it sounds - once the board is etched and
> > cut, a dab of solder paste onto each pad, mount the diodes, then into
> > the oven for a couple of minutes.  (There's a wonderful site out there -
> > can't remember where - how to make SMD boards in a toaster oven.)
> >
> > Once the boards are made, I'd like to coat the strings with something to
> > stop them getting damp/dirty with the risk of flash-over.
> >
> > I was wondering if anyone had any experience using silicone bath sealant
> > in this application.
> >
> > Cheers
> >
> > M
> >
> > --
> > Matthew Smith
> > Kadina Business Consultancy
> > South Australia
> > http://www.kbc.net.au
> >
> >
>
>
>