The article discusses the importance of leak testing in the hydrogen fuel cell industry to ensure safety and efficiency. With the rising demand for clean energy, hydrogen fuel cells have emerged as a key technology for environmentally friendly electricity generation. Leak testing is essential for various components like electrolysers, fuel cells, bipolar plates, and tanks to maintain system tightness and prevent environmental harm. Two experts from Pfeiffer Vacuum highlighted the significance of leak testing in a recent webinar, emphasizing safety as the main driver. The evolution of leak testing methods, particularly for bipolar plates, has progressed from time-consuming individual tests to more efficient group testing approaches. However, industry regulations lack clear criteria, leaving room for manufacturers to choose from various testing methods like vacuum tests with tracer gas and pressure decay tests. The article also delves into the selection criteria for leak testing methods, considering factors like pass/fail criteria, gas flow direction, volume, and material characteristics. Assessing environmental conditions is crucial in choosing the most suitable method. The hydrogen economy's move towards efficient and standardized leak testing methods reflects the industry's commitment to advancing clean energy technologies.