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Re: [Amps] Ham sells fine grit thing to clean contacts

To: "'Charles H'" <>, <>
Subject: Re: [Amps] Ham sells fine grit thing to clean contacts
From: "Jim Hargrave" <>
Date: Mon, 17 Aug 2015 08:23:47 -0500
List-post: <">>
See comment embedded below.


73, Jim - <> 


From: Charles H [] 
Sent: Monday, August 17, 2015 12:10 AM
To: Tom Osborne < <> >; <> ;
Subject: RE: [Amps] Ham sells fine grit thing to clean contacts


it will be a few weeks until I get whatever this man sells, but it
is very unlikely sandpaper coated with silica only.
"EmEry" Emery on paper for fine grinding is mostly aluminum oxide
for whatever good or ill that means.

A file makes me nervous due to the temptation to push too hard.

[W5IFP]  A Contact file is the best thing to clean contacts. They do
not have conventional cutting groves. The abrasive surface is
chemically etched giving it a fine texture that will not flake off
and embed into the contact surface. They come in  different

Ladies etched fingernail files are good for cutting pitted contacts.
Google "relay contact burnishing tool" will give many hits. 

I have used white typing paper which works on very little
oxidation/corrosion but can be seen as a dark smear on the white
paper which tells you are getting something off the contacts.  Fully
black silver contacts usually will not come clean enuf with just

I have not tried spray-on contact cleaners, sold by that naming, nor
carbon tetrachloride (yes I can buy that).   I have used commercial
silver polish, for tableware and granny's candelabra, on silver coax
sockets and that works good on medium tarnish but needs lots of
rubbing and the really black tarnish resists that polish about half

I am open to good suggestions.  Charly

> Date: Sun, 16 Aug 2015 18:28:02 -0700
> From:  <>
> To:  <>
> Subject: Re: [Amps] Ham sells fine grit thing to clean contacts
> Someone told me once that strips of paper from a brown paper bag
> good for cleaning relay contacts. 73
> Tom W7WHY
> On 8/16/2015 6:13 PM, Jim Hargrave wrote:
> > Sandpaper is a no no on relay contacts. It leaves minute sand
> > particles imbedded in the contacts, especially silver plated
> > Use a metal contact file or good grade of extra fine Emory
> >
> > 73, Jim -  <>
> >
> >
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