The time has come to tap into green hydrogen’s potential contribution to a sustainable energy system. In the transition towards a hydrogen economy, sealing technology plays a pivotal yet challenging role. As hydrogen becomes increasingly utilized in various sectors such as transportation, energy storage, and industrial processes, the demand for effective seals escalates. One of the primary challenges lies in the unique properties of hydrogen itself, including its small molecular size and high diffusivity, which can lead to leakage over time if not properly contained. Additionally, the compatibility of seal materials with hydrogen and its potential embrittlement effects present formidable hurdles. Moreover, the diverse range of applications within the hydrogen value chain, from high-pressure tanks to intricate fuel cell systems, necessitates versatile sealing solutions capable of withstanding extreme conditions while maintaining long-term reliability. Addressing these challenges requires interdisciplinary collaboration, innovative materials research, and meticulous engineering to ensure the safety, efficiency, and sustainability of the burgeoning hydrogen economy.