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Subject:	Re: Immersion Silver question
From:	Steve Kelly <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Steve Kelly <[log in to unmask]>
Date:	Tue, 6 Dec 2005 13:01:12 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (132 lines)

Thanks. The adhesive meets NASA outgassing specification SP-R-0022 ( <
1.0% TML and < .10% CVCM)> The adhesive is DuPont acylic. No sulfur.
Regards Steve Kelly

Steve Kelly
PH: (416) 750-8433
FAX: (416) 750-0016
CELL: (416) 577-8433


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: Tuesday, December 06, 2005 12:50 PM
To: [log in to unmask]
Subject: Re: [TN] Immersion Silver question

Yes, watch the adhesive out gassing, it can wreck the solderability.
That is the reason that you cannot via plug silver boards - the
solderability is severely degraded due to the plug gasses during
adhesive cure.

John Burke
Senior Manager - Operations , Optichron
[log in to unmask]
W: 510 249 5233
M: 408 515 4992
http://www.optichron.com
Profile: https://www.linkedin.com/e/fps/2665502/

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee parker
Sent: Tuesday, December 06, 2005 9:40 AM
To: [log in to unmask]
Subject: Re: [TN] Immersion Silver question

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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