Types of Pad Contamination

How many types of pad contamination have been identified to date? For example, I know that there can be phosphorous and chlorine contamination. Can this type of contamination occur while the board is being populated due to fluxes or poor thermal profiles? It seems that the popular opinion is that it primarily takes place during the plating process.

E. F.

Expert Panel Responses

We have found pads with high levels of sulfate, sodium, ammine, rosin, and nitrate besides the chloride and phosphate contamination.

Terry Munson
President/Senior Technical Consultant
Foresite

Mr. Munson, President and Founder of Foresite, has extensive electronics industry experience applying Ion Chromatography analytical techniques to a wide spectrum of manufacturing applications.

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