RE: [TCML] Capacitor encapsulent

[John Kirby <johncatherine@xxxxxxxxxxxxx>]

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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