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In order to evaluate the influence of environmental condition on durability and permeation properties of sealing rubber materials under high pressure hydrogen gas, a durability tester which enables the sealing rubber to expose repeatedly high pressure hydrogen gas at arbitrary test conditions (maximum pressure is 90 MPa and the range of ambient temperature is from –60 to 100 °C) was developed. In this study, durability and hydrogen permeation properties of peroxide- vulcanized EPDM composite filled with white reinforcing filler were evaluated under hydrogen gas at a maximum pressure of 70 MPa and the range of ambient temperature from 0 to 100 °C. The dependence of the ambient temperature on permeability, diffusivity, and solubility was not influenced by the hydrogen pressure and the shape of specimen. Moreover, although we can regard that hydrogen content was approximately proportional to the hydrogen pressure at ≤10 MPa, this relationship became non-linear when a hydrogen pressure became higher. As for durability, blister damage became more serious with an increase in the hydrogen pressure and ambient temperature. Furthermore, damage by extrusion was also observed at ≥35 MPa due to large gas absorption.

Fracture Behavior and Hydrogen Permeation Properties of EPDM for Sealing under High Pressure Hydrogen Gas