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Dielectric Constant Standards of Materials?

Discussion in 'Electronic Basics' started by Wayne, Sep 26, 2004.

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  1. Wayne

    Wayne Guest

    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
     

  2. Yes, my Reference Data For Radio Engineers lists dielectric constant
    at various frequencies from 60Hz to 25GHz. My CRC Handbook refers to
    the values as "limiting values at low frequencies", and points you to
    NBS Circular 514. They give the values at 20 and 25°C and give the
    nominal tempco in the vicinity of room temperature. Internet sources
    often omit references and other pertinent data that you'll find in
    printed reference books.


    Best regards,
    Spehro Pefhany
     
  3. Wayne

    Wayne Guest

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



    Cheers

    Wayne
     
  4. Joerg

    Joerg Guest

    Hi Wayne,
    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
     
  5. I read in sci.electronics.design that Joerg <[email protected]
    acbell.net> wrote (in <I5H5d.3421$>)
    about 'Dielectric Constant Standards of Materials?', on Sun, 26 Sep
    2004:
    I don't suppose too many people would object to the hiring spree, but
    the tax hike is quite another matter.
     
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