This work presents the experimental characterization and modeling of the material behavior of a filled epoxy system between ambient ( $${20}\,^{\circ }\hbox {C}$$ ) and elevated ( $${180}\,^{\circ }\hbox {C}$$ ) temperatures for future use in structural evaluations of epoxy-based potting materials in electric traction drives. An initial classification of the material behavior is carried out based on monotonic tensile tests of various strain rates. The material is then characterized experimentally in a testing program which includes a dynamic mechanical analysis, step relaxation tests with intermediate unloading, a thermomechanical analysis, a curing shrinkage analysis, and tensile and compression tests. The characterized behavior is modeled using a linear thermo-viscoelastic material model with time-temperature superposition governed by the Arrhenius shift function. A successful validation of the resulting model is presented. The material model can accurately predict the epoxy system’s rate- and temperature-dependent constitutive behavior, as well as effective chemical shrinkage, which is of particular importance for the structural evaluations of potting materials in electric traction drives.