FW: [TCML] TC Newbie, disregard US plastics lead

["Jim Mora" <wavetuner@xxxxxxxxx>]

Sorry, bad number. I will find some to pay my pentance;-)

-----Original Message-----
From: Jim Mora [mailto:wavetuner@xxxxxxxxx] 
Sent: Saturday, December 06, 2008 2:27 PM
To: 'Tesla Coil Mailing List'
Subject: RE: [TCML] TC Newbie

Hi Gary,

Your right! PET is lossy with after the fact investigation. However, your
correction brings to mind series parallel combinations... some bottles are
made from polypropylene which has the highest dielectric strength per mil on
my chart and low high freq dissipation. Lookie here:
http://members.tm.net/lapointe/Plastics.htm 
Glass seems a bit archaic yet expedient and classic.

I am building a large control cabinet and can't start yet another project!
Worth an experiment anyway, anyone?

Jim Mora
PS:
US plastics has 16 OZ #66560 with cap $ .52 sorry no Corona or Millers;-( A
trip to the grocery may be rewarding. Most Medicine jars are PP. Lots of
cups like Subway's are pp too though only larger ones are likely thick
enough for experimentation purposes. Start watching! PP is #5 in the recycle
triangle in the US on the bottom.

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Lau, Gary
Sent: Saturday, December 06, 2008 9:25 AM
To: Tesla Coil Mailing List
Subject: RE: [TCML] TC Newbie

PETA is a very lossy dielectric.  But even beyond that, I think that plastic
bottles are not a good choice for bottle caps.  Any time there is corona,
visible or not, that will rapidly degrade and melt a plastic dielectric and
result in a puncture, and that is true regardless of whether or not the
plastic is a lossy dielectric.  Glass is much more resistant to corona than
plastic, so glass bottle caps can survive even with corona.  Corona is the
reason that commercial plastic dielectric HV caps are constructed as many
lower voltage units in series - so that the voltage across each section will
be below the "corona inception voltage".

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Jim Mora
> Sent: Saturday, December 06, 2008 1:25 AM
> To: 'Tesla Coil Mailing List'
> Subject: RE: [TCML] TC Newbie
>
> Hello,
>
> I wonder if 1 or 2 liter PETE coke (or whatever) clear plastic bottles
could
> be used. PETE has a very high dielectric strength and puncture resistance
> and is thin enough to really raise the capacitance and lower the weight a
> bit. Maybe PE bottles which are thicker though.
>
> Jim Mora

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