Dielectric Constant Standards of Materials?

[Wayne]

Hi

I have searched the web and found many lists of dielectric constant lists.
However, non of them make ref. to where they acquired the information from.
1/ Can anyone tell me where I can find the dielectric constant tables for
different materials at dif. temps.
2/ What frequency do they use for measuring the dielectric constant value
for example if you look at the chemical datasheet for say IPA it says the
dielectric constant is equal to 18.3 @ 25 degC. However, they do not say
what the frequency is? What is the standard method for measuring dielectric
constants; as it value changes as frequency changes with some materials?


Cheers


Wayne

 

[Joerg]

Hi Wayne,

Is there a standard body that list them such a NIST (although I can not find
anything on NIST)?


Standard bodies generally don't go as far as dealing with properties of

each individual material. They only deal with the fundamental units such
as time, weight, distance etc. Anything beyond that would require a
hiring spree on their part and a huge tax hike, something we all don't
want ;-)

Also, the formulation for certain materials is not under their control
but under that of companies such as Dupont who can change parameters at
any given time.

Take a mundane material most common to folks like us, FR4. I had boards
where a simple vendor change caused the dielectric constant to veer a
little bit while both vendors insisted it was FR4.

Regards, Joerg

http://www.analogconsultants.com

 

[John Woodgate]

I read in sci.electronics.design that Joerg <notthisjoergsch@removethisp
acbell.net> wrote (in <I5H5d.3421$nj.3193@newssvr13.news.prodigy.com&gt
about 'Dielectric Constant Standards of Materials?', on Sun, 26 Sep
2004:

Standard bodies generally don't go as far as dealing with properties of
each individual material. They only deal with the fundamental units such
as time, weight, distance etc. Anything beyond that would require a
hiring spree on their part and a huge tax hike, something we all don't
want ;-)

I don't suppose too many people would object to the hiring spree, but
the tax hike is quite another matter.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk