We have been laminating with single ply construction at our Buffalo
facility for three months now and have not experienced any problems. We
have recently started to laminate with single ply at our Maple Grove
facility and have run into a problem. I was wondering if anyone has come
across this same problem. What we are seeing is copper spots in the oxide
after lamination. We etched the foil off of several panels and to one
degree or another we have seen these spots. We ran several test lots with
the single ply 7628 high resin layup and our standard 1080/2116. The copper
spots did not show with the 1080/2116 layup. We are using Electrochemicals
oxide and we go into a post dip(reducer). Our laminate supplier seems to be
leaning toward the oxide as the problem. If anyone has experienced this
problem let me know.

Anthony Carfagna
Engineering Manager
Universal Circuits, Inc. - Buffalo

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