Correct! However, if your building high temperature materials like polyimide, Cyanate Ester, or PPO blends, then you need to keep the oxide deposit at a <thin> controlled deposit thickness. Or else the tall crystalline structures of the oxide will snap at the base and separate similar to what's described. It's best to use a brown or red oxide which is short and nodular in structure. (Kinda like a field of mushrooms) Not like the old black oxide. (Which was more like a forest of feather like trees.) This is why I needed more insight into what materials and press cycles might be used. Groovy ______________________________ Reply Separator _________________________________ Subject: Re: Re[2]: FAB Delamination Author: [log in to unmask] at SMTPLINK-HADCO Date: 6/2/96 2:12 PM Dave Hoover: Help me out here please. From the point of view of the inexperienced, it seems that when the delamination occurs at the copper/oxide interface, it seems to the uninitiated that it is simply because the bond between the oxide ant the prepreg is stronger than the bond between the oxide and surface. So, if you had a VERY GOOD oxide, it would perform like this, as you want the oxide/copper bond to be the weak link. True?? Where is the hole in my logic?? Rudy Sedlak