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What tacky flux should I stick to?
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I wanted a rude username:

--- Quote from: OwO on April 19, 2020, 05:50:39 am ---There are NC-559-ASM clones, most of which work very well and is hard to tell from the original. The usual caveats apply; avoid ebay and carefully vet vendors on aliexpress. Get one that doesn't claim to be genuine amtech; you will have less chance of getting "fake" nonperforming flux.

--- End quote ---

The Hanwuyou one you use is scarce on AliExpress in 100 g tubs, but cheap on Taobao. Thanks for the tip!
Shock:
It's cheap and someone else uses it, must be safe!
Alphaprot:

--- Quote from: wraper on April 20, 2020, 02:26:59 am ---I suggest Alpha OM-338. Stellar soldering performance, long work time, non conductive even before activation and relatively inexpensive compared with other branded fluxes.

--- End quote ---
I just looked that up because I haven't heard of the Alpha brand before. It turns out that this is a solder paste ^^ But well - technically it does contain no-clean flux for lead-free  ;D
Thank you anyway.

Thank you for your valuable recommendations, folks, much appreciated :)
According to my little research, here is an incomplete list of what no-clean tacky flux brand (NOT distiguishing between use-case lead-free/lead/both) is supplied by what distributor:

TME: AMTECH, ALPHA
Mouser: Chemtronics, Chip Quik
Farnell: Chemtronics, Chip Quik, CIF, EDSYN, MG Chemicals (but rather narrow product range/line-up)
Digikey: Chemtronics, Chip Quik, Kester, Multicore, SRA Soldering Products
RS-Components: Chip Quik, Circuitworks, ERSA, MBO, STANNOL
ARROW: MG Chemicals (rather narrow product range - one syringe)
wraper:

--- Quote from: Alphaprot on April 20, 2020, 07:33:49 pm ---
--- Quote from: wraper on April 20, 2020, 02:26:59 am ---I suggest Alpha OM-338. Stellar soldering performance, long work time, non conductive even before activation and relatively inexpensive compared with other branded fluxes.

--- End quote ---
I just looked that up because I haven't heard of the Alpha brand before. It turns out that this is a solder paste ^^ But well - technically it does contain no-clean flux for lead-free  ;D
Thank you anyway.

--- End quote ---
It's flux, not solder paste. https://www.tme.eu/en/details/topnik-gel-bga/fluxes/alpha/om-338/
OM-338 PT is solder paste.

Datasheet: http://www.marox.sk/images/produkty/tavidla/om338.pdf
Alphaprot:
Thanks for the clarification, my bad @wraper

Added ALPHA then in my little list..
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