The terms used in describing hydrogen embrittlement have precise definitions. The terminology and its proper usage must be completely understood to communicate and transfer information adequately within the field.

The terms defined in other terminology standards, are respectively identified in parentheses following the definition.

1.1 This terminology covers the principal terms, abbreviations, and symbols relating to mechanical methods for hydrogen embrittlement testing, which are present in more than one of the standards under the jurisdiction of ASTM Committee F07 on Aerospace and Aircraft. These definitions are published to encourage uniformity of terminology in product specifications.