Pyrex diss. factor

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Pyrex diss. factor
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Tue, 24 Feb 1998 20:08:35 -0600
• Approved: tesla-at-stic-dot-net

----------
From:  Bert Hickman [SMTP:bert.hickman-at-aquila-dot-com]
Sent:  Tuesday, February 24, 1998 8:34 AM
To:  Tesla List
Subject:  Re: Pyrex diss. factor

Tesla List wrote:
> 
> ----------
> From:  HomerLea-at-aol-dot-com [SMTP:HomerLea-at-aol-dot-com]
> Sent:  Monday, February 23, 1998 7:57 PM
> To:  tesla-at-pupman-dot-com
> Subject:  Pyrex diss. factor
> 
> I am thinking of winding some coils on 4 inch Pyrex glass tubing but want a
> high Q coil. Does anyone have a reference handy that lists the dissipation
> factor for Pyrex glass? I know it is lower than soda glass but don't know how
> much lower.
> 
> jim heagy

Jim,

I checked "Dielectric Materials and Aplications" by von Hippel:
Pyrex (Corning 7060 - Soda-borosilicate) has a loss tangent of around 28
in the Tesla Coil frequency range of 10^5 - 10^6 Hz. Alkali-Silica glass
(12.8% Na2O, 87.2% SiO2) comes in at around 240-159 in the same
frequency range, and soda-lime silicate is similar, but a bit lower for
the same frequency range (140-100). 

Jim, I also suspect that, other than doing an actual measurement of
secondary Q, you'd be hard pressed to distinguish any performance
difference between these as a Tesla Coil secondary coilform.

Safe coilin' to you!

-- Bert --

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