Graham,

I thought I would have an earlier version as well, but alas I do not.

In any case, my recollection was that this spec was for the more generic
'solders' [at <300-400°C liquidus] and not the more higher temp 'brazes'
like the 780°C CuAg eutectic.  

My use of the terms 'solders' and 'brazes' may not be totally correct [Dave
H can provide clarification], but I would suggest, as others have, that the
'silver' solder you are looking for is the low temp Sn62 Pb36 Ag2 [Sn62 at
180°C], or Sn96.3 Ag 3.7 [which we used to call 'Sn96/4' or Sn96 at 221°C],
both being eutectic solders.

We used to use both for soldering on thick film Ag, Pd/Ag, or Pt/Pd/Ag's to
mitigate leaching of the Ag bearing inks.

Since this is apparently for a PWB application, I think one could reasonably
argue that anything above Sn96/4 is unlikely to be desired.

Get snow?!  Michigan dug out again.  Will let you know how the next round
is..

Steve C





______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------