Review on GSParts Harris Stay Silv Soldering Temperature by Marco Hubbard

This is the only flux that can be used with silver solder which I have used in commercial refrigeration for 40 years. Copper on copper with a silver content of 5 to 15% can be soldered without flux. I use this flux to solder copper to brass on the evacuation valve in coolers. You can use this flux to join copper to steel, brass to steel, but you must use at least 45% silver solder. This amazing flow makes hard work easy. Without him I would not have been able to work in the refrigeration industry. Oh, it takes Oxy. and act. To do its job, it flows like oil at 1200 degrees.