Excellent reference Bert! Thanks for the link!
Mark Stolz
Pearland, TX
________________________________
From: Tesla <tesla-bounces@xxxxxxxxxx> on behalf of Bert Hickman <bert@xxxxxxxxxxxxxxxxxxxxx>
Sent: Tuesday, September 6, 2016 10:19 AM
To: homerlea@xxxxxxx; Tesla Coil Mailing List
Subject: Re: [TCML] bottle caps
Hi Jim,
A good on-line reference for dielectric properties of many common
materials can be found from the National Physical Laboratory:
http://www.kayelaby.npl.co.uk/general_physics/2_6/2_6_5.html
Dielectric properties of materials 2.6.5<http://www.kayelaby.npl.co.uk/general_physics/2_6/2_6_5.html>
www.kayelaby.npl.co.uk
Unless otherwise stated this page contains Version 1.0 content (Read more about versions) 2.6.5 Dielectric properties of materials. The absolute complex permittivity ...
The above source shows that, in general, borosilicate glasses have
significantly lower dielectric losses than soda-lime glass. The lower
the alkali content in the borosilicate glass, the lower its dielectric
loss, and the higher its chemical resistance. Most laboratory glassware
is made from either alkali-free or low-alkali borosilicate glass.
Borosilicate lab glass is a fairly low-loss dielectric. It is about as
lossy as polypropylene at room temperature, and it has almost twice the
relative permittivity (~4 versus 2.2 for PP). However, glass dielectric
losses rise rapidly with temperature. This has lead to thermal runaway
and hot-spot dielectric punch-through failures in foil/soda-lime
glass/foil caps used in TC tank circuits.
Bert
homerlea--- via Tesla wrote:
>
> Anyone know if borosilicate glass used in labs works better(less lossy) than the normal soda lime glass of regular bottles for making salt water capacitors?
> Jim Heagy
>
>
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--
Bert Hickman
Stoneridge Engineering, LLC
http://www.capturedlightning.com
Alternative email: berthickman1@xxxxxxxxx
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