SRA Solder 135 Rosin Paste Soldering Flux For Electronics, No Clean Flux Made for Lead and Lead-Free Solder Circuit Boards and Copper Electrical Wire - Safe Residues with No Goopy Mess (2oz 2-Pack)

This is good flux

Great product! Fast shipping, highly recommend seller!

The value and quality of this solder flux met my expectations.

Often solder will come with a rosin flux core, which is usually fine for basic soldering things together. But for trickier projects having a bin of this stuff is a must. For years I've been plagued with desoldering woes "Why wont this wick work", "why isn't the factory solder melting", "do I really need to run my iron at 410°C to melt lead-free?", etc... No longer. This flux is thick and waxy cold but melts instantly, doesn't evaporate, and can tolerate a lot of heat before burning. It's easy to apply, just use a brush, toothpick, or dip the leads of your component into it. By stripping away oxidation it allows solder to easily adhere to other metals improving your thermal transfer and the resulting joint. If you've ever tried soldering but it won't stick to your wire, it's because you need some of this stuff. I will say, if you let it burn it can be a bit of a hassle to clean up. Isopropanol dissolves it, but once burned you're going to need to scrub. Not that it really matters, leaving the residue of rosin flux isn't really harmful because it's not very corrosive.

Funciona muy bien.