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Date: | Tue, 6 Dec 2005 12:39:44 -0500 |
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Steve
The heat alone should not cause a problem; at AT&T we baked immersion silver boards at this temperature for a variety of reasons. What may be of concern are the gases resulting from activating the bonding adhesive, many of these contain sulfur which may tarnish the silver. I doubt, however, it will cause an assembly problem.
Best regards
Lee
J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389
----- Original Message -----
From: Steve Kelly<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Monday, December 05, 2005 3:26 PM
Subject: [TN] Immersion Silver question
Good Afternoon,
If we have to thermally bond a stiffener onto a flex circuit which has a
thick (IPC- 4553) silver coating will it tarnish. The thermal cycle
will be approx. 360-370F for 1-1/2 hours under pressure. Thanks in
advance. Steve Kelly
Steve Kelly
PH: (416) 750-8433
FAX: (416) 750-0016
CELL: (416) 577-8433
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