How do you seal the most elusive molecule in the universe? In this episode of Adhesion Matters, we explore the unique role adhesives and sealants play in the hydrogen economy. From membrane–electrode assemblies (MEAs) in fuel cells to valves, pipelines, and high-pressure tanks, hydrogen’s small size creates extraordinary challenges: permeation, embrittlement, and cyclic fatigue. We highlight sealant chemistries that can stand up to these demands—including silicones, fluorosilicones, and hybrid polymers—and explain how companies like Dow and Henkel are engineering hydrogen-ready sealing solutions. We also dive into ISO and SAE test standards that define allowable leak rates and durability benchmarks, and look ahead at innovations such as self-healing sealants and seal-in-place gasketing.  Whether it’s cars, trucks, ships, or stationary power, hydrogen fuel cells depend on adhesives that keep the smallest molecule safely under control. This episode shows how the right chemistry is critical for scaling the hydrogen future. 

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