dendrites look like tree leaves...jk abcd -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Stadem, Richard D. Sent: Tuesday, September 12, 2006 8:45 AM To: [log in to unmask] Subject: Re: [TN] PbCO3 Reuven, Can you tell us the difference between dendrites and whiskers? -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Reuven ROKAH Sent: Tuesday, September 12, 2006 7:04 AM To: [log in to unmask] Subject: Re: [TN] PbCO3 Hi Ingemar, 1. Are you sure its Lead (Pb) Wishers? pls inform how? 2. Dendrites is another phenomenon than whiskers. 3. Can you repeat with this kind of failure? ("whiskers?"). Best Regards Reuven ROKAH e mail: [log in to unmask] "Ingemar Hernefjord (KC/EMW)" To <ingemar.hernefjo [log in to unmask] [log in to unmask]> cc Sent by: TechNet <[log in to unmask]> Subject Re: [TN] PbCO3 12/09/2006 12:56 Please respond to TechNet E-Mail Forum <[log in to unmask]> ; Please respond to "Ingemar Hernefjord (KC/EMW)" <ingemar.hernefjo [log in to unmask]> Klein Wassink mentiones a little about Tin Whiskers (dendrites). One guy here at our company has written a paper about Tin whiskers. NASA have a lot about Tin whiskers. Et cetera. But few have anything about Lead whiskers. Only thread I have is one picture from Klein Wassink. That picture is like a copy of our own photos. Question is if anyone of you have any idea about the following: A. Can Lead whiskers grow through Humiseal acrylic? I've heard that Tin whiskers can. B. Can alcalic saponifier cleaning of BGA high lead balls start whisker formation? C. Do Lead whiskers burn off easily like Tin whiskers, or are they "stronger" ? D. What can the reason be that the Lead whiskers grow only around the ball's "equator" ? E. The CBGA platform is said to come from IBM. Do they differ from others on ball making? These questions may not be suitable for this forum, but I make a try, well knowing that many of you are extremly experienced. Thx in advance Ingemar Hernefjord Now SAAB Microwave Systems --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------