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July 1997

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Subject:
Re: Oxide Post Bake
From:
George Wheadon <[log in to unmask]>
Date:
07 Jul 97 12:09:04 EDT
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One possibility often overlooked is the physical damage to an oxide that can be
caused by the initial closing of a press.  Fortunately this can be evaluated by
simply closing and opening the press and pulling the copper foil away from the
pre-preg.  In some cases, a severe transfer of the (black) oxide to the pre-preg
can take place, the detached oxide can then flow with the resin possibly
contributing to ET failures in final?.   Some oxides are worse than others for
this transfer  effect.

George  

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