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Re: Blown Rolled "Hull" Capacitor Discussion

[snip]

>
>I have not built a rolled capacitor, only vertical stacked plate.
>I also had problems until I used tranformer oil and used a vacuum
>pump to remove all air.
>
>Scott Myers
>

Scott,

One of the problems that you can run into with PVC pipe and PVC end caps is 
that if you try to use a good vacuum pump, you can suck air THROUGH the PVC 
end caps!  I put a vacuum pump on one of my caps after filling with oil to 
see if I might be able to coax some additional air out from between the 
layers of plastic and aluminum.  I was pleased to see a lot of bubbles 
rising up thru the oil.... only they never stopped.  I became suspicious and 
poured some oil into a capacitor housing that had no cap in it and connected 
the pump.  Sure enough, the vacuum pump could pull air right thru the pvc 
plastic end cap.  Although a vacuum can pull air through the plastic, oil 
will not leak out.  The result of trying to use a vacuum pump was that I 
ended up sucking millions of air bubbles INTO my capacitor, not what I was 
trying for.
Anyone else tried this with better luck?

Bert