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

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

I use this whenever I need to tin the tips of magnet wire. That's the main purpose, being able to dip something before applying solder to it. Works like it should.

Makes the solder flow, good cost

Great product, performs as expected. The only thing I don't like is the can its packaged in. It's difficult to pry open. To make the task of removing the top easier, I used a flathead screwdriver to make a indentation in the bottom section of the can. I did this by: nserting my flathead screwdriver in between the top and the bottom sections of the can, held the can steady, and then I lifted up on the handle while applying downward pressure on the lip of the bottom can with head of the screwdriver. The bottom lip should have a "V" shaped indentation that will allow easy access to the flux.

This flux paste does its job perfectly and performs just as expected. Great product for a very reasonable price.

Works and tastes great

does the job right

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.

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Great flux, very good value!

Other flux would turn yellow over time but this doesn't, been using it for a long while now, still white

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