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[TCML] Re: Polypropylene vs Metalized Polyester

Hello All.
Even if these capacitors aren't suitable for Tesla coils, hundreds of 33nF 15KVdc MKT can be used for other HV devices such as: 
- Cockcroft Walton voltage multipliers.
- Marx generator
- storing HVdc energy
- pulsed HVdc devices (few pulses per seconds max)
- X-ray machines

On 12/11/2024 02:40, skip@xxxxxxxxxxxxxxxxxxxxxx wrote:

Gary,
I was afraid of that.  I was hoping they might be useful since I came into possession of a few hundred of these.

Skip

-----Original Message-----
From: Gary Lau<glau1024@xxxxxxxxx> Sent: Monday, November 11, 2024 7:03 PM 
To: Tesla Coil Mailing List<tcml@xxxxxxxxxxxxxxx>
Subject: [TCML] Re: Polypropylene vs Metalized Polyester

Unfortunately, polyester, a.k.a Mylar, is not a suitable dielectric for Tesla coil tank circuits, it is too lossy and will overheat and fail in short order.  Polypropylene is what you want.

On Mon, Nov 11, 2024 at 6:59 PM<skip@xxxxxxxxxxxxxxxxxxxxxx>  wrote:


I have seen that polypropylene is the best choice for Tesla coils.
What would be the comparison with Metalized Polyester.



I have "inherited" a good quantity of Metalized Polyester caps from
Wesco at .033uF / 15KVDC.  Would these be good tor Tesla Coil use?



Skip



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