This test method will provide a guide for the choice of metallic materials for applications in high pressure hydrogen gas.

The value of the P_He/P_H2 ratio will be a relative indication of the severity of degradation of the mechanical properties to be expected in hydrogen.

1.1 This test method covers the quantitative determination of the susceptibility of metallic materials to hydrogen embrittlement, when exposed to high pressure gaseous hydrogen.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.