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August 1997

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Subject:
ASSY:Solder mask staining
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Tue, 5 Aug 1997 14:41:21 EDT
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From: Marianne Romansky
      Process Development, Celestica
Subject: ASSY:Solder mask staining

Are IPC-TM-650-2.3.38 and 2.3.39, "Surface Organic Contaminant Detection Test"
reliable methods for determining whether organic or inorganic contaminants are
present on the surface of a PWB? Is the "No residue should be seen.",
paragraph 5.3.2, criterion attainable in testing boards produced under ideal
conditions?

These questions arise from a search for the source of staining on gold
wirebond pads.

Thanks in advance.

Marianne Romansky                          Phone 1(416)448-6284
Celestica Inc.     [log in to unmask]    fax          -4736
844 Don Mills Rd., MS34/178, North York, Ontario M3C 1V7 Canada

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