Phospher bronze is one of the commonest metals that connector pins are made of. However it is usually a base metal that is plated over with tin/lead or nickel finished with gold. I have never heard of the connector being offered unplated. Do your print notes call out a finish over the PB? Could these have come to you from the connector vendor unplated by mistake? PB does not solder up very well, it usually needs some type of preplating that will allow it to be soldered. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Wee Mei Sent: Sunday, January 08, 2006 7:33 PM To: [log in to unmask] Subject: [TN] Solder Wettability Problem Hello, During assembly inspection, noticed that the solder joints on the 2 sided leads for Hirose connector, MQ172-3PA do not wet well. From the datasheet, it seems to be of phospher bronze. As I am not a chemical gal, is this the cause as we are using Sn37/Pb63 solder with liquid flux. Thanks in advance for your response. Regards, Wee Mei --------------------------------------------------- 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 -----------------------------------------------------