I have a question regarding dielectric constant of FR4. How does Dk change in case you increase the temperature from room temperature to maybe 150 degree C. I remember I have seen once a curve somewhere, which showed Dk increasing drastically when the temperature went up. Is this correct and what would be the explanation behind. Walther *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************