Pyrex diss. factor

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: Pyrex diss. factor
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Thu, 26 Feb 1998 10:25:38 -0600
• Approved: tesla-at-stic-dot-net

----------
From:  Edward V. Phillips [SMTP:ed-at-alumni.caltech.edu]
Sent:  Wednesday, February 25, 1998 1:38 PM
To:  tesla-at-pupman-dot-com
Subject:  Re:  Pyrex diss. factor

"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 --
"

	One big difference!  The Pyrex won't carbonize in the event
of breakdown, and won't be likely to crack with the heat either,
so it (the glass form) should be more or less indestructible.  Of
course, it will be pretty heavy,,,,

Ed

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