The development of hydrogen as a reliable energy vector is strongly connected to the performance and level of safety of the components of the supply chain. The compatibility of the materials used for high pressure storage tank with Hydrogen is for instance a key issue. Hence, this study focused on the assessment of the permeation of Hydrogen through polymers used as liner materials in compressed Hydrogen storage tank. A test bench has been designed to determine the permeation rate through disc samples of polymer liner materials during the European project Storhy. The operating conditions of the test bench are representative of service conditions. Different materials have been tested at room temperature and 700 bar of Hydrogen. In addition, the permeation rate has been determined as a function of pressure and temperature. The characterization of liner material toward permeation on samples has proven to be a good benchmarking tool for liner materials and helps to design (liner thickness) the final products in accordance with regulations for hydrogen storage tank.