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The Syst\`eme Internationale d'unit\'es (SI system) is about to undergo itsbiggest change in half a century by redefining the units for mass and currentin terms of the fundamental constants h and e, respectively. This changecrucially relies on the exactness of the relationships which link theseconstants to measurable quantities. Here we directly compare the integerquantum Hall effect in epitaxial graphene with that in GaAs/AlGaAsheterostructures. We find no difference of the quantized resistance valuewithin the relative standard uncertainty of our measurement of 8.6\times10-11,being the most stringent test of the universality of the quantum Hall effect interms of material independence.

Graphene, universality of the quantum Hall effect and redefinition of the SI system