Then, the externally applied contact force for binder and mastic is determined mainly by elastic and adhesive forces. Although the adhesive force can affect both the loading and unloading parts of the indentation process, only the unloading segment, for decreasing contact areas, allows for a direct measurement of the adhesive force. Since the loading rate is set so high and there is practically no hold time, the influence of creep in adhesion testing is assumed to be negligible.