Geographic Area(s)
North America

This publication provides a description of the technologies and terminology as they apply to hydrogen fuel production, storage, transport, and use. This publication is a single source of uniform terminology for hydrogen fuel technologies. This publication will be useful to persons involved with hydrogen production, storage, transport and use technologies, regulators, and codes and standards developers.

Status Explanation

Third edition published 2020. The contents of H4 have been added to CGA G-5. After the next edition of CGA G-5 (10th) is published, this document will be retired. Available at