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What tacky flux should I stick to?
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wraper:

--- Quote from: deadlylover on April 19, 2020, 01:01:40 am ---The Chip Quik SMD291 is okay and is more readily available from reputable dealers than the Amtech outside of the US.

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Worst tacky flux I ever tried. Worse than fake Amtech from ebay. Purchased 2 syringes from digikey, now don't know what to do with this crap. Short working time, solders like crap, a lot of foaming, a lot of ugly residues. Also it's conductive in non activated state. So not suitable for soldering with soldering iron as it won't ensure full activation.
wraper:
I suggest Alpha OM-338. Stellar soldering performance, long work time, non conductive even before activation and relatively inexpensive compared with other branded fluxes.
wraper:

--- Quote from: eliocor on April 19, 2020, 11:07:51 pm ---The conductivity test is absolutely nonsense: it should be done AFTER the flux has been activated ;

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Except it does matter a lot because you won't get it to fully activate in many cases, particularly when doing rework.

--- Quote ---it is also true that I _always_ wash my boards with IPA.
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And it won't get it out from beneath SMT components.
deadlylover:

--- Quote from: Shock on April 19, 2020, 05:39:13 pm ---Since you use Chipquik SMD291 try and reproduce the test in this video, it may be counterfeit flux being used as the label appears backwards and marked differently. Chipquik is stated as non conductive, would be interesting to see if your flux is conductive and how residue acts under heat and humidity etc.

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My tube from RS seems to test at about 7-10MOhms just dotting it on the bench, what a piece of crap. Will have to look into other options when I run out.
wraper:

--- Quote from: deadlylover on April 20, 2020, 03:41:05 am ---My tube from RS seems to test at about 7-10MOhms just dotting it on the bench, what a piece of crap. Will have to look into other options when I run out.

--- End quote ---
Just be aware that most Amtech fluxes are conductive as well. IME white creamy fluxes (synthetic) usually are non conductive. Those which are clear/ semi clear usually are conductive.
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