HARRISSSBF1/2 Stay Silv Brazing Flux, 1/2 lb. Jar, Black, White

This product is the only one that I work with since I discovered it!

This flux is great for silver soldering, which flows around 1250f. Solid joint, and cleans up well.

It arrived with large cracks in the container, which allowed flux to leak all over the cardboard box it came in. Potentially very hazardous, as this flux is quite toxic.

I recently took a class demonstrating a particular technique for making prong settings. One of the required items for the class pack was this black flux. I've used several types of flux in the last 20+ years, but had never even heard of this.The first jar opened up inside the packaging and there was black gunk ALL over...so I sent that back for a new jar.We used this flux in the class and it is amazing. First of all, when you paint on a dot of this onto a tiny prong, you can actually SEE it, so you know exactly where it is and whether you got it on the join. It does turn clear once it approaches temperature, so you will see your solder flow. And you can conduct several soldering operations in a row without having to pickle between each step. For production work, that is vital.Prior to this, I usually have used the spray fluxes (like Prips, etc.). They are great, but they coat your soldering board or block with gunk and frankly they don't last as long as they should because of it. With this stuff, you can just use a tiny bit right on the join and not gunk up your expensive block.I highly recommend this flux.

The flux you use makes all the difference! I had seen so many people use precoated brazing rods or dip in borax when hot and braze just fine. I couldn't get it to work. And I needed to do some silver brazing anyway. Finally just ordered the good stuff and it worked PERFECTLY! This jar will last me decades, as will the Harris silver solder/braze stuff I bought. A little goes a long way and it behaves exactly as it should and now I don't even hesitate to set up a project for brazing.