[Elecraft] What is it called?

[Don Wilhelm]

Eutectic only applies to the 37/63 solder alloy.
Eutectic infers two things - 1) it is the alloy with the lowest 
temperature melting point, and 2) there is no "plastic state", meaning 
it goes directly from a liquid to a solid with no plastic state in between.

The second point is the most important to us who solder - it will 
prevent 'cold solder' connections which can result from movement while 
the solder is cooling.  If there is movement during the plastic state, 
the solder may crystallize and have poor conductivity as a result.

For those purchasing solder, the 37/63 alloy is preferred  over the 
60/40 alloy for this very reason.

73,
Don W3FPR

Gil Cross wrote:
>         At the eutectic, the solidus and liquidus temps are the same 
> Gil
>
>   
>