Hydrogen is rapidly becoming a key energy carrier with the potential to revolutionize the global energy sector. With the pressing need to reduce reliance on fossil fuels and mitigate climate change impacts, hydrogen stands out due to its high energy content and environmentally benign combustion. As a leading alternative energy source, the safe and efficient use of hydrogen requires carefully selected and compatible materials. Thermoplastics, renowned for their exceptional tribological properties, are well-suited for dynamic interaction applications. This makes them ideal candidates for manufacturing critical components such as dynamic seals in hydrogen systems.

This study examines the tribological behaviour of PEEK, PPS, and PI composites in various gaseous environments, including Hydrogen, Air, Dry Air, and Nitrogen, against a 316L stainless steel counterface. The investigation covers both continuous (CT2) and reciprocating (CT3) sliding conditions to provide a comprehensive understanding of their performance in hydrogen applications.