Dielectric strength vs. thickness ?

• To: tesla-at-pupman-dot-com
• Subject: Dielectric strength vs. thickness ?
• From: Marco Denicolai <marco-at-vistacom.fi> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Thu, 15 Oct 1998 00:50:47 -0600
• Approved: terryf-at-verinet-dot-com

I got yesterday 2 sheets 2 x 1 meters of Polystyrene (PS), 0.5mm (0.02")
thick.

That costed about $5 each, from the original manufacturer. As well, I also got
REAL data for THIS material, not general data for all PS's in the world.

Dielectric constant:                    2.5
Dissipation factor (-at- 1MHz):            0.0003
Dielectric strength (0.2 mm thickness): >40 kV/mm  (i.e. >1016 kV/mil)
Water absorption:                       <0.1%

So I believe that is a feasible material for my capacitors.

My question is:
I know that dielectric strength (kV/mm) GROWS with decreasing thickness. I got
0.5mm thick PS: how much I should derate its dielectric strength from the
40 kV/mm measured with a 0.2mm thick sheet?



________________________________________________________________________

 Marco Denicolai                   Vista Communication Instruments, Inc.
 Hardware Development Manager      www.vistacom.fi   

 marco-at-vistacom.fi                 Kaisaniemenkatu 13 A
 fax:    +358-9-622-5610           SF-00100 HELSINKI
 phone:  +358-9-622-623-15         Finland

   Remember, Murphy was an optimist! I am not...
________________________________________________________________________

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