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January 1997

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RE: Dry Film Soldermask
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          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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