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RE: [TCML] Capacitor encapsulent
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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