Sal M. Onella wrote:
"Roy Lewallen" wrote in message
...

For a very long
time I've used 63/37, which is eutectic. This means it has the lowest
melting point temperature for that combination of metals, but more
importantly, it has no plastic state. It goes abruptly from liquid
directly to solid as it cools.

I have some of this and grab it occasionally. It _seems_ that it does not
flow quite so readily as the 60/40. This may be my imagination or perhaps
an issue of external flux being needed. Comments?

Sounds to me like your 63/37 might contain a less activated flux.
There's a lot of variation among fluxes.

Roy Lewallen, W7EL