You may want to double check it. I know that using Ru (in some cases) may cause a problem similar to the one you described. I'd also check (in X-section) where the joints fail (Ni/solder or Ni/Cu interface). Regards, Vladimir Vladimir Igoshev, Research in Motion 451 Phillip St. Waterloo, ON, N2L 3X2 Voice: (+1) 519-888-7465, ext. 5283 Fax: (+1) 519-886-0863 E-mail: [log in to unmask] <mailto:[log in to unmask]> -----Original Message----- From: karpinski [mailto:[log in to unmask]] Sent: Wednesday, February 18, 2004 4:38 PM To: TechNet E-Mail Forum.; Vladimir Igoshev Subject: Re: [TN] Ni/Au solderability on kapton Hi Vladimir, As I know it is Pd. regards Vladimir Igoshev schrieb: >Hi Waclaw, > >Do you know what material (Pd or Ru) your board supplier uses to deposit electroless Ni? > >Vladimir Igoshev, >Research in Motion > >Voice: (+1) 519-888-7465, ext. 5283 >Fax: (+1) 519-886-0863 >E-mail: [log in to unmask] <mailto:[log in to unmask]> > > >-----Original Message----- >From: karpinski [mailto:[log in to unmask]] >Sent: Wednesday, February 18, 2004 4:15 PM >To: [log in to unmask] >Subject: [TN] Ni/Au solderability on kapton > > >Recently we have solderability problems with Ni/Au kapton flex boards >(0,1 µm Au, 3 µm Ni, 35m Cu). >We have produced and assembled large number of boards. >On 10 % of the boards we observe interconnection failures after final >assembly of the pcbs. If the suspected solder joints are lightly >stressed , the connections are easily broken, leaving an open circuits. > It is easy to peel these parts with solder material from the boards. >The pads below the removed parts are discolored dark gray and are sleek . >Some times the handsoldering of the broken joins was successful but >after small strain the joints broke again. >Additional vapor phase soldering did not improved the the strength of >the joints. >This is new problem for us. Does anyone have any experience with this? >How to rework the boards? How to determine when a board should be >reworked or >scrapped? What about reliability issues? Latent failures? >I would appreciate your help very much > regards > >-- >Waclaw Karpinski >I. Physikalisches Institut >RWTH Aachen >D - 52074 Aachen > >--------------------------------------------------- >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 847-509-9700 ext.5315 >----------------------------------------------------- > >--------------------------------------------------- >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 847-509-9700 ext.5315 >----------------------------------------------------- > > > > -- Waclaw Karpinski I. Physikalisches Institut RWTH Aachen D - 52074 Aachen Sommerfeldstr 14, Turm 28 Tel.: +241 802 7181 Fax.: +241 802 2623 Mobil: 0049 173 70 22 548 --------------------------------------------------- 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 847-509-9700 ext.5315 -----------------------------------------------------