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January 1997

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Subject:
Re[2]: Dry Film Soldermask
From:
"sbryan" <[log in to unmask]>
Date:
Mon, 13 Jan 97 17:11:43 PST
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     Tom, give me a call or a private e-mail if you want to discuss this.
     
     Scott Bryan
     Zycon Corp
     [log in to unmask]

______________________________ Reply Separator _________________________________
Subject: RE: Dry Film Soldermask
Author:  [log in to unmask] at corp
Date:    1/13/97 3:01 PM


          There is an inherent difference between LPI and dry film 
          soldermask, in that dry film mask is three-dimensional.  LPI 
          mask floods the board, whereas dry film leaves triangulated 
          pockets along the edge of surface features.  It is these 
          pockets where solution entrapment occurs.  This is why the 
          cleanliness numbers aren't as good with dry film mask.
          Tom Coyle
          Field Services Engineer
          HADCO Corporation
     
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