Hello!  We're having a discussion here regarding the inspection criteria for
PWB coupon microsection lifted lands after thermal stress.  We're just
cutting over from military procurements to more "commercial" and are trying
to decide what makes sense.  The specifications state:

Mil-P-55110E allows a maximum lift of 0.001 inch.
Mil-P-55110D before ammendment 4 allowed a lift of 0.003 inch maximum.
IPC-RB-276 states "lifting allowed" for all classes (no limit).
IPC-A-600D allows a maximum lift of 0.003 inch.
IPC-A-600E allows a maximum lift of ?????

What is the purpose of this requirement?  Do we need a limit?  If we need a
limit what is the "industry standard" limit from board house and OEM
viewpoints.  We've been calling out IPC-RB-276 class 2 with a 0.001 inch
limit.  A couple of our board houses tell us 0.003 inch is the "industry
standard".  Any and all comments appreciated.

-Gregg Klawson
GTE Government Systems COrp
+1.508.880.1822
mailto:[log in to unmask]

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