[TCML] Capacitor encapsulent

[bartb]

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 at hp.com> wrote:
>
>   
>> From: Lau, Gary <Gary.Lau at hp.com>
>> Subject: RE: [TCML] Capacitor encapsulent
>> To: "Tesla Coil Mailing List" <tesla at pupman.com>
>> 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 at pupman.com
>>>       
>> [mailto:tesla-bounces at pupman.com]
>> 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 at pupman.com
>>>       
>> [mailto:tesla-bounces at pupman.com]
>> On
>>     
>>> Behalf Of Raymond Magdziarz
>>> Sent: Friday, May 22, 2009 6:38 PM
>>> To: tesla at pupman.com
>>> 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.
>>>       
>> _______________________________________________
>> Tesla mailing list
>> Tesla at www.pupman.com
>> http://www.pupman.com/mailman/listinfo/tesla
>>
>>     
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