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Re: [Amps] Use Caution when using Silicon Dielectric Greases

To: "Roger (K8RI)" <>
Subject: Re: [Amps] Use Caution when using Silicon Dielectric Greases
From: Greg Wasik <>
Date: Fri, 6 Jul 2018 10:08:24 -0400
List-post: <>
I have a large egde wound Kintronics roller inductor and I'm using it in a
remote antenna tuner that I built.

I've been using silver conductive grease on the inductor contacts.
(roller)  It is not cheap but you might find a less expensive source....


On Thu, Jul 5, 2018 at 10:15 PM, Roger (K8RI) <>

> Silicone dielectric greases work just fine as long as there is no arcing.
> If there is an arc in the grease, the grease will break down into its
> constituent components, one of which is Silicon Dioxide.  This is not a
> problem as long as the wiper(s) maintain a constant contact. I've used it
> for years. Even used both DC4 and DC5 in ignition systems with only one
> exception. After all, these compounds were designed for and used on the
> ignition systems of B17s.
> However, one distributor cap had a flaw and the grease leaked through to
> the inside. The rotor wiper was fine, but each connection to the spark plug
> wires has a tiny gap. Each gap had a "growth" of Silicon Dioxide which
> eventually grew to the point where the end of the rotor hit it, breaking
> off mostly small pieces which quickly ground the insides into a mess. The
> same thing would happen with an RF arc.
> I haven't used a roller inductor in many years, but I used Silicone grease
> with no problems when I did.
> For those who aren't aware, Silicon Dioxide is Quartz. Fine Quartz is a
> very tough abrasive!  IIRC it was used for the Space Shuttle windows in its
> crystal form which were made by decomposing HSiCl3 at high temperature. I
> do not know the process was implemented.
> --
> 73, Roger (K8RI)
> ---
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