Re: X-ray film capacitors

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

Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-uswest-dot-net>" <bert.hickman-at-aquila-dot-net>

Jim and all,

Per the folks at Kodak at:
http://www.kpgraphics-dot-com/TLC/basics/film.html

Estar = Kodak's brand name for polyester film = makes for poor TC caps

-- Bert --
-- 
Bert Hickman
Stoneridge Engineering
Email:    bert.hickman-at-aquila-dot-net
Web Site: http://www.teslamania-dot-com

Tesla list wrote:
> 
> Original poster: "Jim DeLillo by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <jimdel-at-bellatlantic-dot-net>
> 
>         If the film is unprocessed it contains silver halides
>         If the film is processed it contains metallic silver grains in the
> exposed areas
>         If the film is unprocessed, then processing an unexposed film will
> result in no silver.
>         If you do not want to fully process the unexposed film a solution of
> sodium  hyposulfate(photo fixer) will remove the unexposed silver.
>         If you want to remove the unexposed emulsion entirely, then a
household
> bleach will
>         strip it off quite easily.
> 
> Typically the film is made from Estar (I do not know its dielectric
> properties) in about 7 mil thickness
> 
> << Jim >>
> 
> Tesla list wrote:
> >
> > Original poster: "Christopher Boden by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <chrisboden-at-hotmail-dot-com>
> >
> > >Original poster: "Fred Bultman by way of Terry Fritz
<twftesla-at-uswest-dot-net>"
> > ><royaloakmin-at-home-dot-com>
> > >
> > >Hi all
> > >
> > >With some of the recent discussion of home made capacitors, I decided to
> > >try to
> > >make my own. I used a 4x10 sheet of Kodak dental x-ray film, with a sheet
> > >of Al
> > >foil on each side. I tested it up to 15 kvac, and the discharge was very
> > >hot
> > >and loud. My only concern was what material the film is made out of. Could
> > >it
> > >be lossy at RF like Mylar? How many sheets would I need for 30nf?
> > >Thanks,
> > >Jim Bultman in MI
> >
> > The Geek Group, has access to a LARGE amount of X-ray film sheets in the
> > standard sizes. Both dental (long spools of about 5" wide) and regular,
> > (about 12X18" or so...it's been a few years since I operated a process
> > camera, lol).
> >
> > I'll ask around and get the exact compoud they're made from. I'll also
put a
> > micrometer on a sheet. Anyone who wants to pursue this let me know, I'd be
> > happy to scrounge a bunch of film.
> >
> > Remember, some films (I don't know if X-ray works this wa or not) contain
> > Silver Halide as the photoreactive chemical. Last time I checked silver was
> > a rather good conductor. This could have catastrophic results in a
> > capacitor.  But I don't know enough of the chemistry of X-ray
photography to
> > really say. Anyone out there know?
> >
> > Chris "Your packet-switched-electro-lithographic" Boden
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at http://explorer.msn-dot-com
> 
> --
> Jim DeLillo
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