[en] We present some plate impact experiments on a commercial grade of graphite. The dynamic loadings range between 0.3 and 14 GPa under shock, and reach 23 GPa under reshock in the samples, which were approximately 20% porous and macroscopically isotropic. Material velocity at the sample rear surface is measured and recorded optically with Visar or Perrot-Fabry interferometers. These experimental results are then compared to hydrodynamic simulations, where we use a model that takes porosity into account. Our model is also compared to previously published experimental data. The overall agreement is good.