Does the A or B refer to the metal's position in the composition formula? Sn60Pb40 = Sn60A Sn62Pb36Ag02 = Pb36B Sn63Pb37 = Sn63A Eric Kalgren Electrical Engineer Cobham Defense Electronic Systems Continental Microwave Division 11 Continental Drive Exeter, NH 03833 USA Tel: 603-775-5200 Fax: 603-775-5201 E-mail:[log in to unmask] Website: http://www.cobhamdes.com -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Gregg A. Owens Sent: Friday, January 05, 2007 12:29 PM To: [log in to unmask] Subject: [TN] Solder Designations Dear Technetters: I have had a student of mine ask a question which has stumped me, but should (hopefully) be easy for our metallurgist folks out there. J-STD-001 3.2 Solder refers to Sn60A, Pb36B and Sn63A. To what specific solder alloy do these designations apply? I have looked at J-STD-005B to attempt to find these specific designations (specifically the inclusion of "A" or "B") but without success. Any thoughts? Gregg Owens, MIT Manufacturing Technology Training Center, Inc. Mira Loma, CA 91752 --------------------------------------------------- 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 -----------------------------------------------------