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Re: [TCML] Capacitor encapsulent



220 kV/cm for HDPE.

Bart

John Kirby wrote:
Gary,

I think I have seen a table like this before, and the dielectric strength was also missing for HDPE.  Do you (or anyone) know what it is?

Regards,
John K.

--- On Sun, 5/24/09, Lau, Gary <Gary.Lau@xxxxxx> wrote:

From: Lau, Gary <Gary.Lau@xxxxxx>
Subject: RE: [TCML] Capacitor encapsulent
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Date: Sunday, May 24, 2009, 9:25 PM
Hi James,

I've not been able to locate the dissipation factor for
common types of bottle and pane glass, but realize that all
plastics are not suitable.  Here's a list of common
plastics with their dielectric constants and dissipation
factors.  Plexiglas is PMMA, and its dissipation factor
is rather poor relative to PE and PP. polymer dielectric dielectric dissipation constant strength factor 50Hz / 1Mhz (Kv/cm) 50Hz / 1Mhz (x10^-3) -------- ----------- ----------- -----------
LDPE            2.29 /
2.28 370 .15 / .08
HDPE            2.35 /
2.34 -- .24 / .20
PP              2.27 /
2.25 240 .40 / .50 PVC-plasticized 4-8 / 4-5 270 80 / 120 PS 2.5 / 2.5 200-300 .1-.4/.05-.4 ABS 2.4-5/2.4-3.8 ~400 3-8 / 2-15 PMMA 3.3-3.9/2.2-3.2 140 40-60/4-40
POM             3.7
/ 3.7 400 5 / 5
PTFE            2.1  /
2.1 480 .2 / .2 PCTFE 2.3-2.8/2.3-2.5 550 1 / 20
PA-6            3.8 /
3.4 400 10 / 30
PA-66           8 /
4 600 140 / 80
PC              3.0 /
2.9 380 .7 / 10
PET             4.0
/ 4.0 420 2 / 20
PI              3.5 /
3.4 560 2 / 5 PUR-linear 5.8 / 4.0 >300 120 / 70 PUR-thermoset 3.6 / 3.4 240 50 / 50 PUR-thermoplas 6.6 / 5.6 300 30 / 60
CAB             3.7
/ 3.5 400 6 / 21 Silicone 3.6 200 5-13 / 7

Regards, Gary Lau
MA, USA



-----Original Message-----
From: tesla-bounces@xxxxxxxxxx
[mailto:tesla-bounces@xxxxxxxxxx]
On
Behalf Of James
Sent: Saturday, May 23, 2009 4:28 PM
To: 'Tesla Coil Mailing List'
Subject: RE: [TCML] Capacitor encapsulent

Hi Ray, The problem with window glass is the iron in
it. The dielectric
factor of window glass is POOR. Used as a Tesla coil
capacitor, it will
crack and short your cap out. Use some form of
plastic. Polystyrene,
polypropylene, Plexiglas, etc will be much better.
Now, you might wonder
how I know this. It's a secret. James

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx
[mailto:tesla-bounces@xxxxxxxxxx]
On
Behalf Of Raymond Magdziarz
Sent: Friday, May 22, 2009 6:38 PM
To: tesla@xxxxxxxxxx
Subject: [TCML] Capacitor encapsulent

I'm building my capacitor using window glass and brass
sheets. I plan on
using paraffin instead of transformer oil. I would
draw a vacuum on the
container while the paraffin is liquid to get the
bubbles out and then
let
it solidify. Will this work, or what problems will I
have.
Ray M.
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