[Amps] Dielectric grease for roller inductors?

[MU 4CX250B]

I’m dubious about using conducting grease for roller inductors.
Generally, I’ve used  a thin coating of dielectric silicone grease for
that kind of application. The purpose is to lubricate the roller
connection, to keep moisture out, and to inhibit oxidation. Under the
pressure of the roller against the coil, there’s a good metal-to-metal
contact. Using silver bearing grease as an interface between the
roller and the inductor surface just puts a lossy, grainy material
where it will do no good. Conducting grease is mostly useful where one
needs a good thermal bond, as on a CPU IC or heat sink surface.

This debate comes up regularly with respect to lubricating the center
pin of PL259 connectors. Although it seems counterintuitive, using a
small amount of pure silicone grease is far better than putting a
conducting lubricant on the center pin.
73,
Jim w8zr


Sent from my iPhone

> On Jan 2, 2020, at 10:11 AM, Jim Thomson <jim.thom at telus.net> wrote:
>
> Date: Sun, 29 Dec 2019 11:02:34 -0600
> From: Rob Atkinson <ranchorobbo at gmail.com>
> To: "Lou Everett, Sr." <loueverettsr at gmail.com>, "amps at contesting.com"
> <amps at contesting.com>
> Subject: Re: [Amps] Dielectric grease for roller inductors?
>
> <MG Chemicals Silver Conductive Grease.  Cat. No. 8463-7g  7 grams 1/4
> <oz.  http://www.mgchemicals.com Toronto Canada 1-800 201 8822
> <https://www.mgchemicals.com/products/greases-and-lubricants/conductive-greases/silver-conductive-grease-8463
>
> <Comes in a syringe dispenser.  $22 on Amazon.  Getting enough to smear
> <all over an inductor would cost more than the inductor.
>
> <73
>
> <Rob
> <K5UJ
>
> ##  since  I  have  to  order  more...cool-amp  silver  plating  compound,   I  will  also order  some...conducto-lube  at  the  same time.
> Its  way  cheaper  vs  buying  the  MG  chemicals  silver  conductive  grease.   2/4  ozs  will last a long  time. Indefinite shelf  life.
>
> ##  Conducto  lube is 75%  pure  silver  and 25% mineral  oil.   Its  made  for  sliding  contacts,  and  mine  are  all  sliding.
>
> ##  I  will  also  experiment  with  it  on  some  spare model  88  band switches  I  have in  the  shop.
>
> ## 1 oz  covers 480 square  inches.   Comes  in   1-2-4-8  oz  containers.
>
> Jim  VE7RF
>
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