Oddly enough Alan,
You've caught me out here.
In all of the Refrigeration work I've done with installing and jointing copper Air Conditioning and Freezer Gas and Suction lines, I've only ever used Silphos rods.
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What really got up my hooter in the UK was some idiot deciding that 'boss white' was dangerous for potable water joints made with hemp/oakum
We use graphite paste here with Brass Hot-Water Cylinder elements, in combination with the Hemp.
I've used it since the start of my Apprenticeship and I are'nt going back now!. [Linked Image]
Oddly enough Alan, do you think that we should start a new topic?.
Different solders and other such engineering things never seem to get a mention here.