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Re: Polyester resin coil coating?



Tesla List wrote:
> 
> Subscriber: cfbrush-at-interport-dot-net Sun Jan 19 22:01:07 1997
> Date: Sun, 19 Jan 1997 16:14:17 -0500 (EST)
> From: Charles Brush <cfbrush-at-interport-dot-net>
> To: tesla-at-poodle.pupman-dot-com
> Subject: Polyester resin coil coating?
> 
> Hi everyone,
> 
> For a while now I've been eyeing some clear polyester casting resin at one
> of the local industrial plastics places (the kind of stuff they use for
> making clear paperweights with embedded objects).  I was just down there
> yesterday and they had a number of different types, as well as other fun
> things like two part foam mixes, epoxies etc.  Anyway, I was just wondering
> if the casting resin would be any good as a coil coating.  I vaguely
> remember someone saying a while ago that Polyester was NOT a good
> dielectric and was very lossy.  Just thought I'd check for sure, since this
> stuff looks awfully useful (to pot chokes in perhaps).  The Behr Build
> sounds great, but I'm interested in finding something less brittle since
> Chip(?) mentioned cracking problems with cold temperatures.  Maybe I'll
> stick with varnish, but thought I'd ask at least.  Thanks in advance for
> any input!
> 
> Charles Brush
> http://www.foundrygroup-dot-com/cbrush
> server down at the moment :(

Charles,

One of the other coilers on the list was going to try this stuff out a
while back (Steve Sanders?), but I don't remember hearing the outcome.
If you're going to use it, you may need to use somewhat more hardenner
in order for the thinner layer to cure in a reasonable amount of time.
For this application, its the dielectric strength that's more important
than the dissipation factor - it should perform quite well in this
regard. However, it won't adhere as well to the wire and coilform as the
epoxy resins will...

Safe coil formin' to you!

-- Bert --