TMT-FP-1 Rosin Flux Paste, 2.0 oz (57 g)

priced right

Just as described.

Excellent no nonsense flux. The design of the cap makes it impossible to remove and it pisses me off

COOL FIND

I’d been soldering for while without flux and super frustrated with the results. With a little of this flux, the solder flows so much better. You get a good size which will last a hobbiest like for years. It’s easy to apply and my soldering has improved substantially.

Works great. Just needed some flux for some projects and this works great. No issues and definitely worth it. Quality stuff.

Works good

From the MSDS obtained online from the manufacturer, this is 40-60% petrolatum (vaseline) and only 35-45% rosin (originally pine tree sap; often a synthetic blend of chems these days). By comparison, High quality Radio Shack rosin is minimum 65% rosin and works like a dream. "Flux" comes from the Latin for "to flow". A mild acid in melted rosin removes the oxidation layer from the surface of exposed metals (wire strands for my purposes) and coats them so that solder can flow freely between the strands and form a sound joint. Without a flux like rosin, you end up getting a "cold solder" where the surfaces of the joint are coated with blobs of solder but it doesn't penetrate the wire strand bundle to the center. That is a weak solder joint and prone to failure. Vaseline does nothing to deoxidize metal, though it can help molten solder flow more easily, so that's kind of a mediocre way to "extend" the rosin. And it's cheaper to manufacture. Like many things, with rosin flux you get what you pay for. Next time it'll be Radio Shack flux... Next time I'll buy a different brand that's all rosin or at least mostly rosin, but this time I needed it in a hurry and this petrolatum-based rosin flux was the only reasonably priced product that shipped by prime as fast as I needed. I use this to assist soldering with cheap crummy Chinese rosin-core flux solder that barely has any flux in it (decent, more expensive domestic solder contains sufficient good quality rosin flux inside), and tend to slather it on my connections with a flat toothpick, so there ends up being enough rosin in the vicinity to get the job done. Keep in mind that soldering makes a tough physical connection; though tin/lead solder will conduct electricity, it does not do so as well as copper wire. Soldering is for durability, not to conduct electricity. Rosin core solder/flux is only for electronics work, not plumbing (acid flux that would destroy electronics) or making stained glass (expensive silver solder). Different solders and different fluxes for those applications. For a hobbyist electrician, a few ounces of flux will probably last for years; decades for the rare tinkerer. At least you know the vaseline won't evaporate in that time, argh!

The Flux is good and it is the best one should expect in this price range but the container is an issue and when you finally get it to open the flux is all over the underside of cap.

worked ok

Honestly have a hard time saying this is good for Beginners. You never really know if you have enough and so you always end up putting more than you need or not enough. Which if you're trying to level up your sensitivity to electronics can add an extra hurdle. Outside of that, it is the best value for your dollar so I can't complain here.

Makes soldering a whole lot easier and less mess. Great product.

Excellent the best I have used to date.