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 hybr...