[TowerTalk] "Eutectic Solder"

[Roger L. Elowitz]

Hi Jim,

I've never heard of this material [eutectic solder] although I've been
involved with ham radio and electronics for over forty years. {Most likely
because I've been living under a rock. ;-)} Guess it's never to late to
learn something new... and because of great tidbits such as yours on the
reflector... we all profit.  Thanks a million for contributing to the
knowledge pool.

Roger, K2JAS

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At 08:51 AM 3/25/97 +0000, you wrote:
>Esteemed Reflectees:
>
>>
>>And... for you chemists (or alchemists)... what is it about a eutectic
>>solder that makes it any different than ordinary flux-cored 60/40?
>>Enquiring minds want to know?
>>
>>Roger, K2JAS
>>
>
>        Roger, the property most valued in using eutectic (63/37) solder is
>not the "melting point", but rather the shorter time the solder is in the
>liquid state. This minimizes the risk that vibration can disturb the "set",
>and thus the quality, of the finished joint. There are one or two other,
>related qualities of importance as well.
>
>        I believe NASA QC specifications for all flight (spacecraft)
>hardware still call for using only eutectic solder. If anyone wants more
>info, e-mail me directly and I'll look it up.
>
>        An additional point is the quality (or lack of) of the resin (rosin)
>in the core. Lots of junk solder on the market has stuff in the core with
>really rotten (ie, hydroscopic and/or corrosive) qualities. Beware.
>
>73 de Jim, KF7E
>
>Jim Henderson
>jhenders@tdrss.wsc.nasa.gov
>jhenders@zianet.com
>
>
>
>
>Jim Henderson
>jhenders@tdrss.wsc.nasa.gov
>jhenders@zianet.com
>
>
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