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Re: Dielectric constant table



Original poster: "June Heidlebaugh" <rheidlebaugh-at-desertgate-dot-com> 

Terry F: I know you think you are correct, but just to keep the board
correct. I use mmc capacitors and poly oil capacitors. Oil capacitors are
messy and large but the deliver much more current per pulse than dose the
mmc capacitors. Yes my commercial high power pulse capacitors do supply even
higher current but 250 pounds each  in a bank of 3 is not very
transportable. So please don't say no one makes their own oil filled
capacitors.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, September 18, 2003 5:33 PM
Subject: Re: Dielectric constant table


 > 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?
 >
 >