Steve,

  Are you sure that it was the flux? What I have heard is that the copper will dissolve because of the high tin content of lead free solders. This was further illustrated to me when I asked the question about removing insulation and tinning Litz wire. One of the recommendations that was made to me was to use a low tin content solder (70Pb/30Sn) to avoid "necking", or dissolving the copper wire.

  I have also heard about problems with trying to rework lead free solder joints...small pads will sometimes just disappear.

  -Steve Gregory-

Steve Kelly <[log in to unmask]> wrote:
  Good Morning,
Can any one point me to some papers showing problems with no-clean lead
free flux. I just returned from a customer who did some extensive
thermal cycling on some parts we soldered with no -clean lead free 96.5%
tin, 3% silver, and .5% copper. The flux was so active it started to eat
through the copper. Not a pretty sight. Thanks in advance. Steve Kelly

Steve Kelly
PH: (416) 750-8433
FAX: (416) 750-0016
CELL: (416) 577-8433


---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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
-----------------------------------------------------


---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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
-----------------------------------------------------