Hi,

I am sorry to have put the DELAMINATION in subject line. It is nothing to do
with delamination.

Thanx
Badri

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /*
Sent: Wednesday, November 07, 2007 6:32 PM
To: [log in to unmask]
Subject: Re: [TN] Delamination of lead free PCBs

Hi Badri,
Your 'Subject' line says: "Delamination of lead free PCBs," but your problem

has nothing to do with delamination.
You have in fact 2 problems not related to any delamination.
(1) the thickness of the inner-layer traces is not thick enough according to

specifications and your customer belives that the current carrying [not 
voltage] capacity of the 35 micron tracks is insufficient for their use.
Whether or 
not this is in fact true is immaterial-the PCBs have not been manufactured
to 
spec.
No salvage for these PCBs.
(2) there are discontinuities in the PCB interconnects on over 50% of the
PCBs
-you do not give any details on the responsible failure mode. This could be 
either because of via barrel cracking or inner-layer (post) separation-no
way 
of knowing without x-sections.
No salvage for these PCBs.

ACTION ITEMS:
(1) Do a failure mode analysis-this will tell you what needs fixing.
(2) From (1) you can tell whether the design is adequate for Pb-free 
soldering or whether the root cause is production quality [track thickness
and/or 
other reasons]. 
If it is a design/specification issue, you may want to get my White Paper 
"Recommendations for PCB FAB Notes and Specifications in Printed Circuit
Board 
Drawings for SnPb and Lead-Free Soldering Assemblies, the Qualification of
PCB 
Shops and Activities to Assure Continued Quality."
If it is a quality issue, fix it.



Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com



**************************************
 See what's new at http://www.aol.com

---------------------------------------------------
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
-----------------------------------------------------







Disclaimer:
===========
This E-mail may contain privileged information and is intended solely for the addressee. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. If you have received this mail by mistake, please inform us immediately and delete this mail. Any information expressed in this mail does not necessarily reflect the views of Avalon Technologies (P) Ltd .
Avalon Technologies(P) Ltd shall not be responsible nor liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt or damage to your system. Avalon Technologies(P) Ltd does not guarantee that the integrity of this communication has been maintained nor that this communication is free of interceptions or interference.We have taken precautions to minimize the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses. 


Thank you for your cooperation

AVALON TECHNOLOGIES MAY MONITOR ALL INCOMING AND OUTGOING MAILS.

*************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************

---------------------------------------------------
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
-----------------------------------------------------