Here is a calibrated material model for a PTFE (MCalibration software, and then export the model to you favorite FE software. The calibrated material model is the PolyUMod Three Network (TN) model.) with a few percent graphite particles and a few percent of glass fibers. The material was tested at room temperature. To use this material model you will need to first install the
Note, you can get a free trial license to MCalibration and PolyUMod using the link on the main page.