Re: drying coil forms

• To: tesla-at-pupman-dot-com
• Subject: Re: drying coil forms
• From: "Dr. Resonance" <Dr.Resonance-at-next-wave-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 05 Dec 1999 12:52:42 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

to: Jim

PVC is extremely hygroscopic especially at the surface.  It links with water
molecules in the air to form a surface that "tracks" at high voltages.
That's why other materials such as phenolic and ceramics are used especially
with RF currents at high potentials.

Drying and sealing the surface is a "must" for quality HV work.

Regards,

Dr. Resonance


-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Saturday, December 04, 1999 9:22 PM
Subject: Re: drying coil forms


>Original Poster: Jim DeLillo <jimdel-at-bellatlantic-dot-net>
>
>Why does PVC have to be dried at all.  Is it not plastic? Is it not
>impervious to moisture?  What am I missing here?
>
>
>Tesla List wrote:
>>
>> Original Poster: "Herwig Roscher" <herwig.roscher-at-gmx.de>
>>
>> Paul,
>>
>> >      1) does anybody have any good drying techniques/setups they'd be
>> willing to share?
>> I've (mis)used our sauna for this job. Just below the ceiling the
>> temperature was 95 deg Celsius = about 200 deg Fahrenheit. I've dryed the
>> form for one hour and coated it while it was still warm.
>>
>> Herwig
>
>
>

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