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Flux clean up after soldering boards?

Discussion in 'Electronic Basics' started by Jeff, Jan 20, 2004.

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  1. Jeff

    Jeff Guest

    Hi, a simple question; what's the best method or material to clean off the
    flux residue from boards. Using rosin core solder..
     
  2. Ross Mac

    Ross Mac Guest

    Denatured alcohol works well as does Everclear...(190 proof). There are some
    nice spray on products if you go to google. If you have a some freon, that
    works excellently but is no longer legal...good luck, Ross
     
  3. Louis Bybee

    Louis Bybee Guest

    What are the negative, and positive (if any) considerations for removing or
    leaving flux deposits on the circuit board after soldering?

    Thank you.

    Louis
     
  4. Ross Mac

    Ross Mac Guest

    I am probably not qualified to answer that question on a loaded board. The
    suggestion was just for home brew type cards. In the type of work I did, it
    never seemed to make much of a difference if the flux was cleaned or not.
    Though we did it for cosmetic reasons. As for a bare industrial board, they
    use a piece of equipment called a Sirometer to measure surface insulation
    resistance that will vary according to contaminants left on the board. The
    board is immersed into a 75/25 mixture of alcohol and water with a couple of
    resin filters. Dependant on remaining contaminants, the SIR readings will
    show in spec or not. There's a lot of info on Google on such devices, so I
    won't drone on here. The piece of equipment I seem to remember is an
    Omegameter. Hope this was of some help...if not....the price was
    right!....Ross
     
  5. Flux can grow moldy given the right temp/ humidity. Causes leakage
    between traces... bad news for analog circuits, don't know about digital.
     
  6. Ross Mac

    Ross Mac Guest

    Most of my electronic experience was in California where humidity was not an
    issue...as I said..."in my experience"...perhaps a small window into the
    world of electronics.....
     
  7. dB

    dB Guest


    Flux residue is hygroscopic (it absorbs moisture).
     
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