Are you talking about weave impressions left from low resin to glass ratio materials? If you are, the answer is get away from using that nasty old 7628/7629 material facing foil. Go resin rich for no weave impressions and better innerlaminar bond strength with better resist adherence. Earl Moon ----- Original Message ----- From: Anne Ledger <[log in to unmask]> To: <[log in to unmask]> Sent: Tuesday, August 17, 1999 5:45 AM Subject: [TN] Innerlayer issue > Good Morning Technetters, > > I have a question for board fabbers. Problem: We are experiencing > weave texture on our innerlayer material. I have spoken to the > manufacturer who states that weave does shift in the "pour" of the > material (when the resin is added) and that there is no specification > that controls the depth requirement of the weave. The topography is > visual prior to lam/image. The condition is causing our resist to lift > slightly and allows an etch stain on the double treat foil that so far > we can not remove. Question: Is this a typical condition of innerlayer > material (other manufacturers)? Is it double treat foil only? Is there > a way to remove this type of etch stain? What is the acceptablity of > stain on inner layer foil? I can't find any reference info in IPC. > > Any and all input would be appreciated. > > Anne Ledger > EMDS, Inc. > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with following text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information. > If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or > 847-509-9700 ext.5365 > ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################