Re: Polyester Film Capacitors

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>

Fruengel talks a bit about polystyrene pulse caps..  I suspect that for
modern manufacturing, polypropylene is preferred for some reason. Maybe PP
has better solvent resistance when cleaning PC boards with caps on them than
PS... PS seems to dissolve in just about anything hydrocarbon based.  Maybe
it's cheaper, or easier to metallize?


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, March 27, 2001 10:46 AM
Subject: Re: Polyester Film Capacitors


> Original poster: "Dr. Duncan Cadd by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <dunckx-at-freeuk-dot-com>
>
> >Polypropylene caps are the lowest-dissipation high-voltage
> high-current
> >caps out there
>
> They probably are, but I can't help wondering . . .
>
> Purely out of idle curiosity, has anyone ever seen high voltage high
> current rated polystyrene caps?  Based on the dielectric properties of
> polystyrene they ought to be pretty good too.  I have an illustration
> in a book from 40+ years ago showing metal-cased polystyrene caps of
>