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February 9, 2012
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Cause of Unusual Contamination?
Cause of Unusual Contamination?
We have 40 PCB assemblies with unusual contamination. Do you have any ideas what the contamination is, and what caused it?
This program first published August 2010
At "Ask the Experts" we submit challenging questions to our panel of distinguished experts. You provide the questions and they provide the answers.

Ask the Experts Questions | Ask the Experts Panel
Submit A Questions | Join the Panel
Expert Panel contributors for this topic:
Dr. Craig D. Hillman, CEO & Managing Partner, DfR Solutions
Mike Bixenman, CTO, Kyzen Corp.
Bryan Kerr, Principal Engineer - CMA Lab, BAE Systems
Karthik Vijay, Technical Manager, European Operations, Indium Corp.
Tim Jensen, Product Manager, Advanced Assembly Materials, Indium Corp.
Terry Munson, President/Senior Technical Consultant, Foresite
Daniel (Baer) Feinberg, Vice President, Fein-Line Associates
Tom Forsythe, Vice President, Kyzen Corporation
Jim Williams, Chairman, Polyonics, Inc.
Comments  »
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How was the area masked off? Might it be contamination contained within the masking substance? Seems as if the area is concentrated within the center of the mask area.

Pat Goodyear, Pacific Gas and Electric
The spots all look pretty much the same size except where multiple hits (dots) glom together. I would not think they were caused by splattering, or drippings, or contaminates. Although I am not an expert on these things.

T.T.
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