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Dielectric Constant of Vinyl Plastic

Discussion in 'Electronic Design' started by D from BC, Mar 21, 2008.

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  1. D from BC

    D from BC Guest

    As per
    http://en.wikipedia.org/wiki/Dielectric_constant
    Teflon in 2.1
    Polyethylene is 2.25
    FR-4 4.35 - 4.7
    Rubber 7

    What's the dielectric constant for vinyl?
    As in black electrical tape.
    Or vinyl graphics film (stickers).


    D from BC
    British Columbia
    Canada
     
  2. According to this page, the dielectric constant for PVC varies with
    composition from 3-6.

    "PVC compounds are moderately good dielectric materials. Depending on
    the formulation, the dielectric constant can vary from 3 to 6.
    Formulations typically include the PVC resin, plasticizer, stabilizer,
    flame retardants, fillers, and specialty additives."

    http://www.madisoncable.com/CableDesign2.asp


    I guess vinyl is the same as PVC.
     
  3. JeffM

    JeffM Guest

    I see a wide range.
    These 2 say it's like pi--about 3.
    http://www.google.com/search?q=cach...C.starts.to.decompose.before.it.melts&strip=1
    http://www.google.com/search?q=cach...lectric.constant+poly-vinyl-chloride+&strip=1

    This one gives 3 as an upper limit and 1.7 as the low end.
    http://www.google.com/search?q=cach...lectric.constant+poly-vinyl-chloride+&strip=1

    Got a dart?
     
  4. D from BC

    D from BC Guest

    Thanks.. Was a little item where I lost my Google patience.
    Must have picked some poor keywords..


    D from BC
    British Columbia
    Canada
     
  5. Tim Williams

    Tim Williams Guest

    It's not bad (holds static pretty well, too), horrible loss though.

    You might find some typical values on capacitor making sites...I remember
    finding tables of K's in relation to Tesla Coil capacitors.

    Tim
     
  6. Paul Probert

    Paul Probert Guest

    Long ago we used some PVC to make some capacitive voltage dividers, and
    found out the dielectric properties were strange. The DC dielectric
    constant was somewhere around 7, but above some frequency in the tens of
    Hz it dropped and became very lossy. Since then I've come across some
    material referring to it as a "polar" dielectric, and now I stay away
    from it whenever possible.

    Paul Probert
     
  7. LVMarc

    LVMarc Guest

    in lieu of an actual measurement, use 3.0 you'll be closer.

    Marc
     
  8. default

    default Guest

    I noticed that too. Very poor dissipation factor at 100 KHZ - stuff
    tends to melt and flow.
     
  9. Rich Grise

    Rich Grise Guest

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