Re: Dielectric constant table

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

Original poster: "kayaker" <kayaker-at-sbcglobal-dot-net> 

Hello All:-)

Terry, for the sake of this discusstion. You are correct, no one wants too
mess around with oil filled caps. With the exception of a few die hard
experimentors, like myself. I like too track down sources and supplies.
Enough of my silly opions. Does anyone know of a supplier of liquid vynal.
Like winding a Tesla Coil. Making your own capacitor may end up being a lost
art.
If it's not painful, it's not gainful.

Doug Allen


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, September 23, 2003 5:11 PM
Subject: Re: Dielectric constant table


 > Original poster: "Nick Andrews" <nicothefabulous-at-hotmail-dot-com>
 >
 > Has anyone tried polypropylene comic book bags in cap construction?  The
 > really cheap ones are polyethylene, but the good ones are polypropylene.
 > Some are mylar, but they are more, and I imagine won't work at HF.
 >
 > Nick A
 >
 >
 > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >To: tesla-at-pupman-dot-com
 > >Subject: Re: Dielectric constant table
 > >Date: Thu, 18 Sep 2003 17:33:55 -0600
 > >
 > >Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
 > >
 > >Hi,
 > >
 > >I just wanted to be sure you were aware that nobody makes homemade oil
 > >caps anymore.  A new cap called the "MMC" has totally replaced them now
days.
 > >When MMC came on to scene, many people just stopped there oil filled cap
 > >projects right in the middle and never went back...  See:
 > >
 > >http://hot-streamer-dot-com/TeslaCoils/MMCInfo/mmcinfo.htm
 > >
 > >http://hot-streamer-dot-com/temp/MMCcapSales.gif
 > >
 > >http://www.thegeekgroup-dot-org/mmc/
 > >
 > >Or, just search on Google for "mmc capacitor"...
 > >
 > >Perhaps you really do want to make one of the obsolete types still, but
 > >just want to be sure you don't go to all that work for no reason.  Since
 > >the MMC, I think most of the rolled poly cap technology sort of stopped
dead.
 > >
 > >Polypropylene is the "best" material by far.  Caster oil gives good high
 > >values and is used in some commercial caps.  The only drawback is the
high
 > >cost.
 > >
 > >As for "novel materials", to my memory, there have been zero sucesses...
 > >
 > >Cheers,
 > >
 > >         Terry
 > >
 > >
 > >
 > >At 04:13 PM 9/18/2003 -0700, you wrote:
 > >>I'm wondering how long it's been since the dielectric tables present on
many
 > >>tesla coil sites have been updated.
 > >>
 > >>I'm also wondering about some of the values on them. For example, the
table
 > >>says that Mylar is good for 7.5Kv *per mil*. However, one of my early
 > >>attempts at a cap using 10 mils of mylar failed at 5000V rms. Something
is
 > >>wrong.
 > >>
 > >>Also, a suggested addition... the giant table at
 > >>http://www.asiinstr-dot-com/dc1.html says that hydrogenated castor oil has a
K of
 > >>about 10 at 80* F.
 > >>
 > >>Speaking of which - Anyone ever considered novel materials to build a
 > >>capacitor? For example, Iodine? Iron oxide? Copper oxide?
 >