[AMRadio] Oil filled capacitors

Gary xfrmrs at roadrunner.com
Mon May 19 16:39:44 EDT 2008

    I would use the 5 minute epoxy. I have seen silicon also track a short 
to ground but not like JB Weld. I have tested the 5 minute epoxy at 5KV and 
it held steady, no problem. Passed a PI test with flying colors.
----- Original Message ----- 
From: "Rick Brashear" <rickb at tx.rr.com>
To: "'Discussion of AM Radio in the Amateur Service'" 
<amradio at mailman.qth.net>
Sent: Monday, May 19, 2008 4:32 PM
Subject: RE: [AMRadio] Oil filled capacitors

Thanks, Gary.  There is nothing better than an actual test to make sure of
the properties of a substance.  Since it showed a short at 500 volts I don't
think it would like the 2500 volts that will be applied to the capacitor.
Maybe I better go with the silicon just to be safe.


Well, I could not resist. I have a tube of JB Weld in the shop and for
giggles put some on a piece of Nomex paper. I then dug out the hipot tester
and started to apply a dc voltage to each side of the glob of JB Weld. At
300 volts it started to show a high resistance leakage and at 500 volts went

to a solid short. I would not use it for the application intended on this

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