Hi Gus
I'm in Philadelphia area, worked in fossil plants that had XLE'S from 1950 thru 1985? I think. We had four at our eddystone station and scrapped two for an Atlas Copco turbine style and sullair. I kept an access door for cast iron material and cut out the raised I/R lettering to hang on shop wall. An I/R field Tech. in Windsor once told me they were the cadillac of I/R's line, last one made around 1994.
Hi Hilmar
The reason for black flux is it holds up under longer times at higher temps then the white flux. Used it on the larger copper joints as they take more effort to maintain a wicking temp. for the 56 stay-silv. The white might have cooked out before achieving success. I also read here about its use on most joints you would use the standard white flux with good results. I only used it on carbides before trying it out on this boiler. It did work out well as I seemed to have to hold a glowing red color at times to make solder flow.
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