Michael,
          
          I check with our local glue guru on repairable bonding film. 
           Here is his somewhat skeptical answer.
          
          Regards,
          
          Dave Sullivan
          Rockwell Collins, Inc.
          
          [log in to unmask]


______________________________ Forward Header __________________________________
Subject: Re: Repairable bonding film wanted...
Author:  pmcarter at po5
Date:    4/18/97 2:17 PM


          
     Dave:
          Suggest he contact reps from Alphametals, 3M, and AI Technology 
     to discuss thermoplastic sheet adhesives. They are "THEORETICALLY" 
     "INFINITELY" (very loosely defined) reworkable. Strengths are good, 
     though not in the epoxy, polyimide, cyanate ester range Usually 
     heatsinks require more of a balance of strength and stress absorbtion 
     than brute strength anyway. Thermoplastic sheet adhesives are 
     available "doped" with fillers to enhance electrical conductivity, 
     thermal conductivity, or both.
          Downside: must fixture to apply uniformly distributed pressure 
     during melt and set cycles, not always trivial, especially in 
     post-assembly operations.
                                             Marc Carter
          
______________________________ Reply Separator _________________________________
Subject: Repairable bonding film wanted...
Author:  ddsulliv at po6
Date:    4/18/97 2:06 PM
          
          
          Reworkable glue...hmmm
          
          
______________________________ Forward Header __________________________________
Subject: Repairable bonding film wanted...
Author:  [log in to unmask] at ccmgw1
Date:    4/18/97 9:53 AM
          
          
          
Gents,
          
I am looking for a bonding film to laminate PCB's to heatsinks...  No big 
deal there, but I need it to be reworkable!
          
Ideally, I would like to remove the PCB from the heatsink while salvaging 
both, including the components.
          
My equipment is Class 3 (airborne).  So basically I want a solution that 
holds on REAL TIGHT during use, but comes apart real easy when I want it...
          
Suggestions?
          
Thanks,
          
Michael Lang
[log in to unmask]
          
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