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Insulating Washer Material Question

Discussion in 'Electronic Basics' started by Rileyesi, Apr 27, 2004.

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  1. Rileyesi

    Rileyesi Guest

    First, thanks to all who replied to my request for sources for insulating
    washers.

    One vendor quoted me PVC washers as opposed to the linen based phenolic washers
    that we have used in the past, but they could not tell me the difference it
    would make in the insulating properties. I hope someone can shed some light on
    this for me.

    The application is in an office environment, so no temperature or humidity
    extremes. The signal that will be insulated is a variable 0-15 VDC at 100 mA
    max. This will be used on the back of an analog panel meter and the function
    of the washers is to isolate the signal from the metal meter case.

    I think the PVC will do just fine, but would like any thoughts the group may
    have.

    Thanks.
     
  2. I have little doubt that the electrical properties of almost any
    plastic are sufficient. The mechanical properties are what you need
    to worry about (creep, crazing, cracking under stress, etc.)
    Reinforced phenolic is very stable under mechanical compression.
     
  3. CFoley1064

    CFoley1064 Guest

    Subject: Insulating Washer Material Question
    Since you're not talking about high voltage or high frequency, the primary
    difference between the two washers will be mechanical. PVC washers will be
    relatively soft, and will deform and will tend to tear or pierce through.
    However, they're much easier to punch/stamp, and should cost less. They should
    be O.K. as long as you watch the torque.

    Why not just use insulated 5-way binding posts? They're relatively inexpensive
    and commonly available.

    Good luck
    Chris
     
  4. Søren

    Søren Guest

    (Rileyesi) wrote in

    If the signal is fairly low frequency and the washers are not compressed
    to the point og tearing, you are in the green.


    --
    Venlig hilsen,
    Søren
    * If it puzzles you dear... Reverse engineer *
    LM317-PSU-Designer v1,0b <http://www.ElektronikTeknolog.dk/cgi-
    bin/LM317/>
     
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