Sheila I have listed below properties values of PTRALUX flexible composites. The numbers should be considered as numbers for setting specifications. The values represent all products (coverlay, bond ply, sheet adhesive, and clads) after cure. The clads have Cu removed. Youngs Modulus Cured adhesive only 85000 psi 6E4 kPa Coverlay, bond ply, clad 150000-30000 psi 1E6-2E6 Poisons Ratio Adhesive only 200-300% Coverlay, bond ply, clad 50 I hope this helps. Best Regards, David Jandzinski Substrate Product Engineer Abpac, Inc -----Original Message----- From: Sheila Smith [SMTP:[log in to unmask]] Sent: Wednesday, November 18, 1998 8:56 AM To: [log in to unmask] Subject: [TN] modulus & Poisson's ratio Help!! Can anyone provide me with the modulus (Young's) & Poisson's ratio for typical polyimide board material? IPC 4104/40, /41, and/or /42?????? Thanks in advance> S. Smith, Tracor Aerospace ################################################################ 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 ################################################################