Re: drying coil forms

• To: tesla-at-pupman-dot-com
• Subject: Re: drying coil forms
• From: Ed Phillips <evp-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Mon, 06 Dec 1999 22:32:29 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List wrote:
> 
> Original Poster: "Dr. Resonance" <Dr.Resonance-at-next-wave-dot-net>
> 
> 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

Dr. R:

	I have read repeatedly of the necessity of "sealing" the surface of
PVC.  While I've never made a TC with PVC pipe for the form, I have made
a number of Van de Graaf generators with PVC for the columns, and have
never observed any analogous effects.  I have a rather small machine
here on my desk which starts and runs just fine even when it's very
humid or raining outside.  Any thoughts?

Ed

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