Diagram for strain rate variation of paraffin wax with different stress exponents in a circurlar rig with an outer diameter of 24 mm for the smaller frosted grip and an inner diameter of 36 mm for the outer frosted grip. All investigated types of paraffin wax exhibit a power low creep behaviour over the limited but experimentally relevant temperature range with stress exponents of 2.6 (Cobbold 1975), 1.8 (Neurath & Smith 1982) and 2.4-4.1 (Mancktelow 1988).