CAIG LABORATORIES, Rosin Soldering Flux (Electrical), Jar, 56 Grams, Pack of 1

This solder doesn't seam to like lead free solder. I tried to solder with lead free and this flux barley works when heated properly. It creates black tarnish and carbon flakes. Doesn't remove anything, and make a layer of goo in which the solder won't make a bond with the copper because it repels it like hydrophobic materials. And I can't solder to aluminum or other conductive metals either. The only thing it is good at is cleaning my iron.

Had the Radio Shack branded version bought in the 90s and couldn't find it anymore when I lost it in a move. Tried many others for a few years but once I found the OG version searching one night, I gave them away. The smell, the stickiness, the accidental spill from leaving it on its side and not knowing, wondering how you got it on your desk, all of it was welcomed back once I got this. When you can't get solder to stick, use this and you will have no issues. It does require clean-up but for how well it performs it is worth it. I have ended up with some very professional solder joints. It is also the only flux I use when joining two stranded wires together with a fan and twist joint. It helps the solder to penetrate the joint quickly allowing you to control the solder pool so it's not larger than the wire sheath diameter.

Man I really missed having a bit of flux on the workbench. There are times when rosin core solder is not enough flux.

greaat

It works perfectly

I've never previously used products like then when soldering wires. As a result, I've had difficulty getting the solder to stick to my targets: the solder just beads up on the tip of my soldering iron and it takes repeated attempts to get the solder to go where I want it to go. With this product, when I apply the solder wire to the tip of my iron and hold it close the the wires that I want to solder, the solder flows easily onto my targets. What a savings in effort and time. I'm sure people that use this product probably wonder why I haven't been up to speed. Be advised that this product is specific for soldering electronic things. You cannot and must not use the common flux that is used for soldering pipes.

Very pleased with this; A dip in this makes solder wick easily into stranded wire when tinning, leaving a well-tinned but not overly saturated wire ready for soldering into terminals. Wire does need a proper cleaning following use as it can be sticky. Also, I may consider purchasing the no-clean formula but I still highly recommend. Lastly, I’ve written to Craig with support questions on other products offered and they’ve been very helpful. A trustworthy brand.

Been using for years and it is one of the best I have used.

flows very well, would definitely use this product again. Highly recommended

Excelente pasta para soldar. El unico detalle es que se debe controlar muy bien la temperatura para evitar que se queme la pasta (queda como plastico una vez que se quema). Yo la emplee para soldar cables de cobre chapados en plata con soldadura libre plomo y me funciono muy bien.

I put this flux into a syringe, works perfect for SMD work.. Will buy again

Nice flux paste, does the job very well. Quite goopy and needs alcohol to wash off but works fine. Works great as a tip cleaner also. One thing is the picture on the listing says "deoxit" brand and when I received it says "caig". I feel a bit mislead there but nevertheless it is decent flux paste.

Good product