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May 1998

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Subject:
Re: Particles in holes
From:
Hint pwb1 <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 14 May 1998 13:20:57 EDT
Content-Type:
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text/plain (24 lines) 
Milind,

Look for bugs.  Bacteria in the feed wqater to the electroless bath or the
copper plating bath will cause the problem that you have as related to
particles in holes.  These bacteria will continue to grow even in the
solutions containing copper ions (a good antibacterial) and they can cause
platings that look like fingers or even spirals extending into the holes from
the hole walls.  These bacteria are common in reclaimed/recycled waters and
may even come in from your deionizer tanks.

Phil Hinton

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