This technical reference covers a comprehensive array of evaluations on hydrogen compatibility of a common elastomer material used for high pressure applications, acrylonitrile-butadiene rubber (NBR). The first part of this document addresses the background and motivation of the work and the model materials used for evaluation. The second part details the experimental results obtained from three main aspects: transport properties, physical properties, and mechanical properties. This document may be update and revised periodically in response to the needs of the technical community; up-to-date versions can be requested from the editors at the address given below. The success of this technical reference relies on feedback from the technical community