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Subject: Re: sealing wire feed thru's wit epoxy?

Date: 01/20/02 at 3:25 PM
Posted by: Dick Swisher
E-mail: rswswisher@deskmedia.com
Message Posted:

In Reply to: sealing wire feed thru's wit epoxy? posted by Bill S on 01/16/02 at 2:06 PM:

At your vacuum level you can get away with a lot.
Bare wires are best but usually will short on you.
Magnet wires have enough enamel to ususally not short,but you can't have much voltage between them.
I have used solid hookup wire with vinyl covering (RadioShack stuff).
Big advantage.. it's color coded if you find enough colors.
Get a piece of pipe that will just hold the wire bundle and about 3 inches long welded or brazed into a feedthrough plate.
Stuff all the wires through the pipe, be generous with lengths.
Get a friend to help. Take twin-tube 5 minute epoxy and squoosh it on the bundle as the friend pulls the bundle into the pipe.
Pull excess through and slobber on the other side and pull back.
You are looking for the combination of long leak paths down the insulation and small area of epoxy presented to the system.
Cure it at eleveated temp for a 1/2 hour or so.

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