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SMD soldering flux.
SMD soldering flux.
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Old 13th January 2021, 05:02 PM   #1
edbarx is offline edbarx  Europe
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Default SMD soldering flux.

What SMD soldering/desoldering flux do you use and suggest? I have watched YouTube videos by Louis Rossman doing literally next to impossible SMD desoldering/soldering work, but I have no idea what flux is used. I remember several years ago, I tried to repair an SMD PCB and failed miserably. The FLUX seems to be of paramount importance, and the internet is a nest of vipers ready to bite the innocent. The flux I ordered online was fake. It was much like wax used to steady components in old radios, rather than SMD flux!

SMD soldering would be a feat, but I am daunted by the thought alone!
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Old 13th January 2021, 05:21 PM   #2
rayma is online now rayma  United States
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Stay with major producers, like Kester. You can buy flux in small or large quantities. Use it liberally.
Solder Flux & Solder Flux Pens | Techni-Tool, Inc.
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Old 13th January 2021, 05:54 PM   #3
JMFahey is online now JMFahey  Argentina
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I always use simple homemade flux, just a "stone" of plain pine rosin, bought at the corner hardware store, inside an old jam jar and covered in alcohol which dissolves it in a few days.

I boight 1 kilo some 10 years ago, must have over 900 grams left.

Works like a charm, *bright shiny* solder joints every time.
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Old 13th January 2021, 06:19 PM   #4
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Amtech NC-559 is by far the best. Low mess residue and easy to whipe up with Isopropanol.
I put some from the 100g tub in a small syringe for accurate application.
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Old 13th January 2021, 06:55 PM   #5
chris719 is offline chris719  United States
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SMD soldering flux.
I agree with the tacky flux in syringe recommendation, though I think I have some ChipQuik brand stuff.
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Old 13th January 2021, 07:54 PM   #6
Mark Tillotson is offline Mark Tillotson
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I've got 20g of "Termopasty", a Polish brand, comes in a little snuff tin as solid resin,
so for surface mount I scrape powder off the surface sometimes. But most of my SMT work
is toaster-oven reflowing of PCBs, for which I use ChipQuik lead-free no-clean solder paste SMD291SNL10 which comes in a handy 35ml syringe.
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