Hi Helena:
                        Laminates are insulators and prevent arcing
between two conductors. Separation of laminates or " Delamination" may
allow two conductors to be separated by air instead. Air is not as good
insulator as fiber glass/epoxy laminates or other materials. So
delamination may allow arcing between two traces or pads, which may burn
the board. Short version.   See IPC-A-610D section 10.2 Laminate
conditions
        Regards,
        Ramon

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Pasquito, Helena
Sent: Tuesday, September 12, 2006 12:45 PM
To: [log in to unmask]
Subject: [TN] Delamination

Hi TechNetters,

Let me ask a question; I know delamination is bad, but why?  What is the
failure mode to the board when a board delaminates and would there ever
be an instance that a board that delaminates is still OK to use?  This
is a Class 3 application.  Yes, I know what the IPC standards say but
not real sure about the board process.  Yes, I "googled" and there is a
lot of stuff out there.  Maybe someone can recommend some reading
material (hopefully short and sweet and to the point).

Thanks!
Helena  

Helena Pasquito
Manufacturing Skills Instructor
M/A-COM, Tyco Electronics
1011 Pawtucket Blvd., M/S 107
Lowell, MA 01853
978-442-5024
[log in to unmask]


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