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What's it's tensile strength, melting point, water potability rating?
Strong than any solder you'll ever see, need oxy acetylene to braze quickly and properly, can use for water. It is very expensive but check around evaporators and you can usually find cutoffs on the floor. Just fold them with vise grips and you'll be set. I throw mine away when their about a 1/4".
People, people, people...you braze refrigeration equipment and you solder plumbing equipment. Brazing occurs at temps above 800 degrees, soldering takes place below 800 degrees. For copper to copper use some brand of 15% silver bearing alloy such as Silphos (the phosphorus in the alloy acts as a fluxing agent so this needs no fluxing). For copper to brass or copper to steel use some type of 45% silver bearing alloy (this needs a white water based brazing flux). For soldering I use Sterling brand solder made by Teramet. Has the lowest melting temp of any solder on the market as well as the highest tensile strength. Get on it and get off. Don't cook the flux. Don't cook the pipe or fitting. Grasshopper...you must become one with the flame.
I was looking through a Lenox book I have and they offer this "solder" that has 6% silver, 430 degree melting point, tensile strength of 15,000psi and was wondering it's purpose and uses.
This response is coming a bit late, but what you are describing is Harris Sta Brite. It is a 6% silver bearing solder used with regulation plumbers paste flux.
it's mostly for refer apps were heat sinking might not be completely reliable.
Some ac guys use it but in most places its against code as brazed joints are required.
It is NSF approved as well as FDA. It's good for potable water pipes.