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dielectric constants

Discussion in 'Electronic Design' started by Philip Newman, Oct 17, 2003.

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  1. does anyone know the dielectric constant for...

    fibreglass reinforced teflon?

    No hits on a google search.

    Thanks for any help

  2. It would depend on the proportions of teflon and glass in the
    material, but would have to be a value between the constants for pure
    teflon and pure glass (assuming no voids in the construction).
  3. Robert Baer

    Robert Baer Guest

    Why mess with such a wierd construct that is expensive, hygroscopic
    and porous?
    Teflon by itself has these properties, along with the habit of storing
    pools of charge on/in it.
    Yes, it is very good as an insulator for "low" voltages, but the
    porosity can give nasty troubles at "high" voltages.
    Adding fiberglass to the mix cannot solve these problems, and at best
    might increase its strength.
    If you are looking for a PCB material that has competitive insulation
    capabilities and low moisture absorption *and* low cost, i suggest
    Matsushita Megtron 5755.
  4. R.Legg

    R.Legg Guest

    Google for Laminate dielectric teflon glass, no quotes.
  5. thanks for the help, this was just a reserach question, i dont think ill be
    using it to make anything with, but thanks anyway!

  6. John Larkin

    John Larkin Guest

    Agilent's free Appcad program - the transmission line analysis part -
    includes a table listing the Er values of most commonly used PCB

  7. thats great!! even gives you the manufacturer!


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