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Does anyone know dielectric constand for PEBAX?

Discussion in 'Electronic Design' started by Joerg, Feb 1, 2013.

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  1. Joerg

    Joerg Guest

    Subject line says it all. I've asked several times at vendors, no luck.
    They always think it's dielectric strength, but I need to calculate a
    capacitance.

    Only need a ballpark number.
     
  2. Joerg

    Joerg Guest

    Ya well, I entered all my stuff and when clicking on create account
    nothing happens. Many web site designers aren't worth their salt these days.

    It's unbelievable but in some such cases I actually have to get a sample
    and measure.
     
  3. Joerg

    Joerg Guest

    Thanks, didn't think about the word permittivity because that was never
    used at my schools. 13 would be ugly. The question is where does it
    begin to rise? I need to operate in the 150-400kHz range. Maybe I just
    assume 4 and knock on wood :)
     
  4. Tim Williams

    Tim Williams Guest

    Agreed. My chemistry knowledge says it should behaves something like
    nylon. Not sure what the polyether part would do, electrically, but hey,
    it's in the ballpark. :) That would put the loss tangent around 1% and K
    around 4 or so. You wouldn't want to take it into the microwave, but I
    doubt it'll melt from 400kHz applied to bulk material.

    Tim
     
  5. Joerg

    Joerg Guest

    It ain't my choice, and it's actually going into the blood stream. It's
    a sheath, a standard medical utensil in the world of catheters that goes
    in before anything else does. I already dread the lead vests during
    clinicals, those give me a back pain.

    Note to self: Must lose weight before that.
     
  6. Wimpie

    Wimpie Guest

    El viernes, 1 de febrero de 2013 02:22:59 UTC+1, Joerg escribió:
    Hello Joerg,

    You may visit matweb
    http://www.matweb.com/Search/MaterialGroupSearch.aspx?GroupID=51

    Depending on chemistry (formulation) Dielectric Constant seems to vary between 4 and 9.5 (general page on PEBA on matweb).
     
  7. Joerg

    Joerg Guest


    Move to Spain for the winter to escape the cold? :)

    http://www.matweb.com/search/DataSheet.aspx?MatGUID=18fb730e5ed8471cad1116daa7c85828

    Hmmm ... where did you find the dielectric constant in there?
     
  8. Wimpie

    Wimpie Guest

    El 01-02-13 19:30, Joerg escribió:
    I copied the wrong link...

    The general data is in:
    http://www.matweb.com/search/DataSheet.aspx?MatGUID=57b805a667ee48f7b58b3fd8df1fa17b

    It mentions 4 to 9.5

    From the list of products, click on of the products with the red dots
    (EMS Grivory).
    http://www.matweb.com/search/DataSheet.aspx?MatGUID=1c7c7eccbcc24fb8b7049bccbfaa5ea4

    This will show you product data.

    You are right, the wheater in Spain is better then the rain over here
    (around 20 degr. C. in Malaga).
     
  9. Joerg

    Joerg Guest

    Thanks, Jim. Got it.
     
  10. Joerg

    Joerg Guest

    I think I'll assume 7 for now and call it a day. If I provide enough
    margin in the calcs it should be ok.

    Says "only available to premium members".
    Wish I was there ...
     
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