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    FLUX Removal

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    StevieRay

    Posts : 27
    Join date : 2009-01-09
    Age : 56
    Location : Central VA

    FLUX Removal

    Post by StevieRay on Mon Nov 05, 2018 10:04 am

    Just starting my VTA ST-120 build...I'm building the circuit boards first (TDR and main board).

    For years I've only removed solder flux from PC boards when doing rework, or when the flux was thick, or used a flux pen for rework to help wick solder up.

    What are your thoughts on the necessity of removing flux residue on new board work, and if you say 'yes', then what methods and materials do you use (preferable stuff around the house or hardware store, without buying some super $$ flux remover)?

    Thanks!
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    Peter W.

    Posts : 965
    Join date : 2016-08-07
    Location : Melrose Park, PA

    Re: FLUX Removal

    Post by Peter W. on Mon Nov 05, 2018 11:09 am

    StevieRay wrote:Just starting my VTA ST-120 build...I'm building the circuit boards first (TDR and main board).

    For years I've only removed solder flux from PC boards when doing rework, or when the flux was thick, or used a flux pen for rework to help wick solder up.

    What are your thoughts on the necessity of removing flux residue on new board work, and if you say 'yes', then what methods and materials do you use (preferable stuff around the house or hardware store, without buying some super $$ flux remover)?

    Thanks!

    If you are using a high-quality 37/63 eutectic rosin-core solder, there should be no reason for flux removal after the fact. Keep the tip clean, hot enough, and don't go all blobs with the solder, and you will be fine. I am assuming that you are using lead/tin solder, not RHoS-compliant solder. Should you be using the latter, there are any number of flux-removers on the after-market should there be too much residue.

    https://gokimco.com//media/catalog/product/cache/1/Base%20Image/9df78eab33525d08d6e5fb8d27136e95/e/s/es1696_2.jpg
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    PeterCapo

    Posts : 561
    Join date : 2008-12-05

    Re: FLUX Removal

    Post by PeterCapo on Mon Nov 05, 2018 11:25 am

    I like to deflux just for a cleaner appearance to the work.  As long as it is not on any kind of phenolic material, or anything else that might be harmed, then just isopropyl and a good brush should work https://www.mgchemicals.com/products/cleaning-products-for-electronics/cleaning-accessories/brushes/chisel-hog-hair-857   I'd use at least 91% isopropyl, again, provided the alcohol and water won't harm whatever you're cleaning. This is for rosin core colder. Have not used other kinds of solders - not sure what kind of different cleaner they might need.

    StevieRay

    Posts : 27
    Join date : 2009-01-09
    Age : 56
    Location : Central VA

    Re: FLUX Removal

    Post by StevieRay on Mon Nov 05, 2018 11:42 am

    I would need to look when at home again this evening, but I believe it's Kester "44" tin/lead (no RHoS for me!).  Very fine gauge.

    I have some silver solder but to be honest I've never really used it but a few times -- and I sit here thinking "why" did I use it at all on a 'normal' audio circuit?
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    Peter W.

    Posts : 965
    Join date : 2016-08-07
    Location : Melrose Park, PA

    Re: FLUX Removal

    Post by Peter W. on Mon Nov 05, 2018 11:57 am

    StevieRay wrote:I would need to look when at home again this evening, but I believe it's Kester "44" tin/lead (no RHoS for me!).  Very fine gauge.

    I have some silver solder but to be honest I've never really used it but a few times -- and I sit here thinking "why" did I use it at all on a 'normal' audio circuit?

    Just be sure that it is eutectic solder (67% tin, 37% lead) and you will be fine.
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    cci1492

    Posts : 203
    Join date : 2016-05-09
    Age : 58
    Location : Bergen County NJ

    Re: FLUX Removal

    Post by cci1492 on Mon Nov 05, 2018 12:55 pm


    New2Tubez

    Posts : 25
    Join date : 2018-03-20
    Location : NY

    Re: FLUX Removal

    Post by New2Tubez on Mon Nov 05, 2018 11:52 pm

    StevieRay wrote:I would need to look when at home again this evening, but I believe it's Kester "44" tin/lead (no RHoS for me!).  Very fine gauge.

    I have some silver solder but to be honest I've never really used it but a few times -- and I sit here thinking "why" did I use it at all on a 'normal' audio circuit?

    I used Kester #44 on my ST-120 and did all my cleaning with an acid brush:
    https://www.homedepot.com/p/Premier-1-2-in-Acid-Brush-144-Pack-HST10127/300333372

    kimwipes:
    https://www.fishersci.com/shop/products/kimberly-clark-kimtech-science-kimwipes-delicate-task-wipers-7/p-211240

    and 99% isopropyl alcohol.

    I picked it up from watching an overkill NASA soldering video on youtube. Painful but I managed to learn a little along the way.
    https://www.youtube.com/watch?v=Vynb_HdEIDU

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