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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