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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

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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