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Missing items to buy for my soldering kit
mariush:
As you seem to be from Israel, you may get better prices or better shipping costs if you order from TME.eu or from RS-Components (based in UK)
TME.EU has cheap flux, they sell flux from AG Termopasty which is a Polish company and TME.eu is also based in Poland so you know it's genuine and cheap.
Right now they don't have the version I use (Topnik 83) which was available in bottles of 50ml , 100ml and higher - the 50ml bottle was a few dollars. They only have some gel fluxes right now : https://www.tme.eu/gb/details/topnik-zel_100/fluxes/ag-termopasty/art-agt-089/ or https://www.tme.eu/gb/details/topnik-zel_14/fluxes/ag-termopasty/art-agt-088/
They also have actual resin (colophony), you can get a 500g bag for 5 eur : https://www.tme.eu/gb/details/kalafonia-500/fluxes/ag-termopasty/art-agt-094/
It's activated with 2.5% adipic acid.
You can make liquid flux by mixing 20-25% (or more) of such resin with up to 75% of isopropyl alcohol (high purity, 99% and above) and mix and shake until it's completely dissolved in the alcohol and you get Rosin Flux.
You can make it a bit stronger by adding up to 5% of benzoic acid - https://www.amazon.com/Benzoic-Acid-12oz-55lb-Food-Grade/dp/B07W6JQ7X9?th=1 (this bag would be enough for liters of flux, it's too big, but was first i found on amazon)
It's basically the formula of the Topnik 83 according to the MSDS (<25% rosin, <75% ipa, <5% benzonic acid, <5% adipic acid) : https://www.tme.eu/Document/509fc31f9a9bb47ac8f62e9d1d1bdd58/FLUX-TK%2850_EN.pdf
You can also make those solid flux pucks out of colophony, it's just higher percentage of rosin and you can use those pucks to add flux to your desoldering braid ... just place braid on top of that puck and heat it up with your soldering iron until it "sinks" into the puck then drag the braid through the liquid-ish resin.
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