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This paper studies the temperature-dependence of the electrical resistivity of low-cost commercial graphene-based strips, made by a mixture of epoxy and graphene nanoplatelets. An equivalent homogenous resistivity model is derived from the joint use of experimental data and of simulation results obtained by means of a full-3D numerical electrothermal model. Three different types of macroscopic strips (with surface dimensions of cm2) have been analyzed, differing in the percentage of graphene nanoplatelets. The experimental results sh