Here we go again :-) True BP is due to poor Ni plating (cavitation is evident in Ni-P). Multiple re-flows have nothing to do with that. I think you use the word (BP) in any cases of failure where Ni-P got exposed (the surface look black), which I believe is wrong. If you take a look at a case history on my website, I bet you will agree it had nothing to do with BP, even though the pads looked black. Regards, Vladimir SENTEC www.sentec.ca SENTEC 11 Canadian Road, Unit 7. Scarborough, ON M1R 5G1 Tel: (416) 899-1882 Fax: (905) 882-8812 www.sentec.ca -----Original Message----- From: Werner Engelmaier <[log in to unmask]> Date: Tue, 20 Oct 2009 22:09:41 To: <[log in to unmask]> Subject: Re: [TN] ENIG Issue Hi Vladimir, In what respect? Werner -----Original Message----- From: [log in to unmask] To: TechNet E-Mail Forum <[log in to unmask]>; Werner Engelmaier <[log in to unmask]> Sent: Tue, Oct 20, 2009 10:07 pm Subject: Re: [TN] ENIG Issue Werner, With all due respect, I don't think you are right. Regards, Vladimir SENTEC 11 Canadian Road, Unit 7. Scarborough, ON M1R 5G1 Tel: (416) 899-1882 Fax: (905) 882-8812 www.sentec.ca -----Original Message----- From: Werner Engelmaier <[log in to unmask]> Date: Tue, 20 Oct 2009 22:01:35 To: <[log in to unmask]> Subject: Re: [TN] ENIG Issue Hi George, \While what you say in the first paragraph is correct, the second paragraph is not. 'Black Pad' is not an all-or-nothing proposition. The seeds are sown at the Ni-plating (not the Au-plating) with the P-codeposition. However, multiple or lengthy expositions to high soldering temperatures result in more Ni being dissolved to form IMCs leaving ever more P behind. This can create 'Black Pad' where none existed before. Werner -----Original Message----- From: George Milad <[log in to unmask]> To: [log in to unmask] Sent: Tue, Oct 20, 2009 9:52 pm Subject: Re: [TN] ENIG Issue As always as soon as there is a solderability issue with ENIG, "Black pad" comes up. This is a problem because it does not allow for further investigation. Everyone accepts since this is ENIG then it must be black pad. If this was a black pad issue the back side should have exhibited the same problem. BP occurs during the plating of the gold on top of the Ni. BP cannot differentiate one side from the other. Do not accept BP as the answer and keep investigating. Regards George Milad George Milad National Accounts Manager for Technology Uyemura International Corp (UIC) 249 Town Line Rd Southington CT 06489 [log in to unmask] Cell: (516) 901 3874 --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------