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Date: | Tue, 17 Apr 2007 10:19:20 -0400 |
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Steve
I imagine that the immersion silver finish will perform as well or better
than ENIG. I would be concerned about the chemistry which is very caustic.
Both the materials and adhesives used in flex circuits are sensitive to
caustic chemistry. I suggest you perform an evaluation to determine if this
is a significant issue.
Best regards
Lee
J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389
----- Original Message -----
From: "Steve Kelly" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, April 17, 2007 8:57 AM
Subject: [TN] Immersion Silver
Good Day To All,
One of our customers has asked us to look at changing the finish on a flex
circuit we manufacture from ENIG to Immersion Silver. The circuit is complex
and requires that we laminate on metal stiffeners after the immersion
silver. This would require a full cure cycle of approx. 375F for 1.25 hours
under pressure. The circuit would then have to undergo an approx. 6 hour
bake before assembly. Assembly requires 2 reflows. My question is will the
silver still solder. This is a Class 3 product and we are loading BGA's.
Thanks in advance. Steve Kelly
Steve Kelly
PFC Flexible Circuits Limited
PH: (416) 750-8433
Fax: (416) 750-0016
Cell: (416) 577-8433
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