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Brown Coating on Resistor Lead

Discussion in 'General Electronics Discussion' started by Proschuno, Dec 12, 2013.

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  1. Proschuno

    Proschuno

    87
    1
    Aug 1, 2011
    So ripping apart a television (a casual Thursday afternoon activity…), I've come upon a bunch of these resistors with a brown coating on one lead; at first regarding it as rust, none of the other components are rusting (this was found outside my local garbage dump in my apt. complex, and it just rained when I picked it up…), and also noticing that it glimmers a little on the bottom right of the picture (rust wouldn't do that..). Trying to measure the resistance through it the meter measured infinitely high, but touching the actual metal gave an accurate measurement, and none of these seem faulty.
     
  2. Proschuno

    Proschuno

    87
    1
    Aug 1, 2011
    Sorry here's the photo...
     

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  3. Raven Luni

    Raven Luni

    798
    8
    Oct 15, 2011
    Its laquer and its purpose is to insulate the resistor lead. I'm guessing the resistor was stood upright with that lead folded down. Its basically just to protect it from accidental contact with other parts of the circuit.
     
  4. Proschuno

    Proschuno

    87
    1
    Aug 1, 2011
    It was, forgot to mention that. just found it very interesting, after busting into hundreds of other appliances without ever seeing that on bent resistor leads like that….
     
  5. jpanhalt

    jpanhalt

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    4
    Nov 12, 2013
    I agree, it is a man-made coating. Whether it is lacquer, enamel, PVC, etc. doesn't matter. I would have expected a lacquer coating to be more conformal at the sharp bend.

    In any event, it is not rust (I don't think leads on resistors are steel/iron) or any other product of oxidation.

    John
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,477
    2,820
    Jan 21, 2010
    Possibly a very thin heat-shrink tube used to insulate the lead. I imagine the resistor was mounted standing up. Whatever it was next to, the designer didn't want this shorting out with it.
     
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