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January 1999

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Subject:
From:
Francis Lai <[log in to unmask]>
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Date:
Tue, 12 Jan 1999 20:55:05 -0500
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Every morning, after adjusting of chemicals, we run a 1"x1" pure teflon

which is sodium etched dummy from the PTH line. The last step of the PTH

line is 30 min of electroless copper plating. Every morning, the dummy

reads a copper thickness of 60-70 u in. However after running about 3-4

hours of real production panels in the same PTH line, the copper thickness

measured dropped to 25-30 u in. We make addition of chemicals every 2 hours.

I am just curious to know why. There are no PTH voids. Just copper thickness

is low.

Can any one help.

My e-mail : [log in to unmask]

Thanks!!!!!!!

Francis

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