Steve What is the PWB laminate material? This will determine what possibilities exist for stiffening materials. The possible candidates would be Laminate Cu Different laminate structures Adhesives that will absorb some of the CTE differences CIC Send the laminate type that you are using now, I may be help you further. David Jandzinski Substrate Product Engineer Abpac, Incorporated -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask] Sent: Tuesday, January 05, 1999 12:45 AM To: [log in to unmask] Subject: [TN] Methods for Stiffening a PWB All, We have a current PWB assembly that uses an aluminum stiffener bonded to one surface for mechanical reasons. The problem with this is that during extreme thermal excursions (as required by the operating environment of the assembly) the assembly flexes a great deal due to the expansion mismatch. Luckily, we may have to opportunity to do a re-design of the assembly and move to some different method of stiffening. Our experiences in this subject are very limited, and would greatly appreciate any options for stiffening a PWB from a board design standpoint (i.e.-some type of cored board, other materials either PWB or stiffener, etc.). Thanks in advance for your help. Steve McBride ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################