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December 2005

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Subject:
From:
Lee parker <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Lee parker <[log in to unmask]>
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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