Hello,

Thank you for properly defining the failure, Werner.

We are interested in using a low cure temperature surface mount adhesive to
combat cyclic creep-fatigue such as Loctite 3621 and will be used after the
BGA has been reworked.

Does anyone have experience with Loctite 3621 in this application or would
anyone care to recommend?

Thank you,
 
David


-----Mensaje original-----
De: TechNet [mailto:[log in to unmask]] En nombre de Werner Engelmaier
Enviado el: Tuesday, April 17, 2007 10:38 AM
Para: [log in to unmask]
Asunto: Re: [TN] Tacking corners of BGAs

Hi David,
You confused everybody by calling your problems to be "due to mechanical 
stresses." your problem is cyclic creep-fatigue of the solder due to the
expansion 
mismatch between your BGAs and your PCBs.



Werner



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