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January 1997

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From:
"ddsulliv" <[log in to unmask]>
Date:
Wed, 15 Jan 97 15:26:11 cst
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          Avi,
          
          Each of these direct metallization processes has something 
          going for it.  They can each point to proof sources which 
          would indicate to you that they are fully capable of 
          processing Military PWB PTHs.  So you could get (and sound) 
          confused as to how to make the decision on which process to 
          choose.
          
          My advice is to choose a process which fits well in your 
          shop if you are a PWB fabricator.  A survey of the processes 
          would give you a good idea of how they run.  
          
          I would then get suppliers to audit your shop to show you 
          how their process would run and what exact advantages (i.e. 
          cost, labor, material, scrap) your shop would see with their 
          process.  If a supplier will not do this, they should not be 
          considered.
          
          Check with the proof sources these suppliers give you for 
          confirmation of the value of the direct metallization 
          process.  I have noted that some of these folk list their 
          proof sources in their ads in trade magazines.  Ask the 
          proof source questions on how they run the process, what 
          type of PTHs they plate, what testing they have done, HOW 
          OFTEN THEY HAVE TO CLEAN THEIR MACHINES, what process 
          controls they run, they might even give you process cost and 
          savings data.
          
          Then I would send out test panels to the smaller list of 
          suppliers I would consider.  I would make these panels to be 
          a type which gives you problems through your current PTH 
          line.  If the supplier wanted to put a copper strike on 
          these panels, I wouldn't object.  Some acid coppers do not 
          work well plating direct metallized surfaces.  The suppliers 
          should be able to tell you this when they do their audit.
          
          Test these panels per IPC-6012, class 3.  Choose those 
          processes which pass your testing.
          
          Now your decision comes down to the information you have 
          gathered plus the cost of installing the process (capital, 
          chemistry, etc.).  Which process gives you the most 
          confidence technically, is the easiest to control, gives you 
          the best cost savings to run, is best supported by the 
          supplier in whom you have confidence and is it worth the 
          expense to put it into your shop.
          
          That is the process I would say anyone would have to go 
          through when moving into the direct metallization world.
          
          By the way, I DO have MY opinion on the best direct 
          metallization process for military or any applications.  
          However, that very well might not be the answer for you.  
          Anyone who gives you a direct answer to this without 
          encouraging you to go through the above process is doing you 
          a disservice.  
          
          Good luck.
          
          Regards,
          
          Dave Sullivan
          Rockwell Collins, Inc
          
          [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: Direct metallization for MIL grade PCBs.
Author:  [log in to unmask] at ccmgw1
Date:    1/15/97 12:34 PM


Hi there,
I would like to know which is THE most reliable method of DIRECT METALLIZATION 
for MIL grade PCBs. Do I use Pallidum or Carbon or Ploymers????
My e-mail address is [log in to unmask] 
Thanks in advance.
          
avi.
          
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