Yes, I've already blamed a faux pas on over-exposure to Lead-free.
Dewey
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: Friday, August 25, 2006 10:17 AM
To: [log in to unmask]
Subject: Re: [LF] Copper Pad Peel Strength
Recent rash = epidemic?
Couldn't be the lead free profile disease outbreak in
progress..........could it??
John
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Friday, August 25, 2006 6:43 AM
To: [log in to unmask]
Subject: Re: [LF] Copper Pad Peel Strength
There seems to be a rash of this lately. Could you offline tell me what
laminate material you use for the bare board.
Dewey
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Kane, Amol (349)
Sent: Friday, August 25, 2006 4:30 AM
To: [log in to unmask]
Subject: [LF] Copper Pad Peel Strength
Dear Technetters,
We are having instances where copper pads (Under BGAs) are being lifted
off ENIG Boards almost too easily during rework. We use the same thermal
profile on each board (for the same component removal) and only some
show this phenomenon. Is there a test or standard to test the copper
adhesion @ incoming to see whether it's the fab (i.e. are the boards
coming to us with poor copper adhesion strength to being with) or the
process that's doing this. The board is heated upto 120 C when the
component is reflowed for removal. Also, is there data to show the
decrease in Cu adhesion strength with temp?
Thanks,
Amol Kane
M.S (Industrial Eng.)
Process Engineer
Harvard Custom Manufacturing, Inc.
941 Route 38 Owego, NY 13827
Phone: (607) 687-7669 x349
[log in to unmask]
www.harvardgrp.com
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To temporarily stop/(start) delivery of Leadree for vacation breaks
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Please visit IPC web site
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information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
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To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
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