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In Reply to: Glass as a Dielectric posted by Superfly on August 11, 2003 at 06:13:54:
What exactly do you want to know? There are lots of different glass compositions. Common glass in general is an excellent insulator.
Dielectric constants:
Silica = 3.78 (10^2 to 10^10 Hz)
Pyrex = 5.02 @ 10^2 Hz; 4.84 @ 10^6 Hz
Most mixed composition glasses (such as soda lime silica) have higher dielectric constant than pure silica, some as high as 10.Fibreglass is a mixture of air and glass, so take your pick between air (1) and ~8.
regards
zarquon
Follow Ups:
I should have mentioned this in my post...
I was wondering if it might make a good elevator(cord stand)..= to ceramic, but perhaps slightly better resonant properties.--SF
I should have mentioned this in my post...
I was wondering if it might make a good elevator(cord stand)..= to ceramic, but perhaps slightly better resonant properties.How 'bout wood? If you're concerned about dielectric properties and resonance, wood would tend to have the advantage over ceramic and glass.
Or even simple cardboard perhaps. Just fold it into a simple inverted V, put a small notch at the apex, and voila.
Wood pulp might be worth looking into as well. You know, the stuff they use for egg cartons. Some shipping supply stores carry pyramid shaped pulp corner blocks that might make some nice elevators.
Just something to consider.
se
Well, if you want low dielectric constant and damping properties combined, why not try the closed cell PE foam thick wall tubes, as sold at hardware stores for water pipe insulation. You could stick pieces of this on top of wooden dowels to make short stands, and dress the cable along the tops of the stands - dielectric constant about 1.5 at points of contact, and free air in between, plus the damping properties of closed cell PE foam.Haven't tried it myself, but might give it a go.
regards
zarquon
Well, if you want low dielectric constant and damping properties combined, why not try the closed cell PE foam thick wall tubes, as sold at hardware stores for water pipe insulation.Yup. That's worth giving a go too.
You could stick pieces of this on top of wooden dowels to make short stands, and dress the cable along the tops of the stands - dielectric constant about 1.5 at points of contact, and free air in between, plus the damping properties of closed cell PE foam.
Yup. Or if you don't want or need so much height, you could just put it around the dowel with the dowel serving as a bit of ballast and just lay them on their sides like Lincoln Logs. :)
Haven't tried it myself, but might give it a go.
Couldn't hoit. :)
It's rather moot for me because I just trim the cable's length so they're suspended between my amps and speakers. Just tossing out some ideas for others to consider.
se
Now we're talkin...I think I've heard of people using that before, but I didn't realize it was Poly Eth...Thanks for the idea.--SF
As I understand it, the idea is to isolate the speaker cables from the room carpeting using material that is not conductive to static elcetricity. Since most carpeting contains nylon and other 'miracle' fibers that are subject to absorbing and storing static charges induced by the signals in the cables which then tend to contaminate the signal. Didn't realize that the DA of foam pipe insulation was so low. Good grade of Teflon is approx. 1.5-2.0.Happy Listening !
I use CVH's Cat 5 cables..
placement, and type of stand make audible differences in my system.By the way...Thanks to whoever posted the dielectrics constants web page! Some really good ones I didnt know about.
--SF
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