Re: Repairing paper caps
- From: John Woodgate <jmw@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 4 May 2005 15:10:32 +0100
I read in sci.electronics.design that bigcat@xxxxxxxxxxx wrote (in <1115212714.520312.155440@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>) about 'Repairing paper caps', on Wed, 4 May 2005:
A question re 1920s paper capacitors housed in tins filled with wax: theyre always very leaky, presumably due to damp in the paper. Is it workable to dry them out in an oven at just over 100C? Does it work? Or is this not a wise idea with the wax?
You may not get a fire from the wax but I doubt that the caps will be any good. They corrode at the points where the foil meets the copper lead-out wire, and internally in the winding the paper dielectric pierced by crystals of corrosion compounds (aluminium 'waxate' - waxes are weak organic acids).
--
Regards, John Woodgate, OOO - Own Opinions Only.
There are two sides to every question, except
'What is a Moebius strip?'
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
.
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