Hi Dan: One of the differences is density due to grain size. Hard gold is more dense than soft gold due to smaller grain size. Read: http://www.ingentaconnect.com/content/klu/jach/1997/00000027/00000006/00 171883 Ramon -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Dan Skweres Sent: Thursday, May 24, 2007 11:25 AM To: [log in to unmask] Subject: [TN] Gold content in solder joints Question for you folks.... I'm aware of embrittlement issues with too much gold in solder joints. The question came up here whether or not there is a difference between "hard" gold content verses "soft" gold content? Thanks in advance! Dan --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------