Hydrogen Fuel Cell Seals segmentation by types categorises the market according to functional design and material composition, which directly influences cost structure and adoption rates. O‑ring seals, fabricated from fluoropolymers such as PTFE and FKM, dominate the segment with an estimated 40 % share because of their proven chemical resistance and ease of installation in static joints. Gasket‑type seals, typically multilayered composites, account for roughly 25 % of revenue, serving high‑pressure stack interfaces where uniform compression is critical. Lip seals, featuring elastomeric lips that maintain contact under oscillating motion, contribute about 18 % and are prevalent in rotating shafts of fuel‑cell compressors. Compression seals, designed to absorb axial loads while preserving a hermetic barrier, represent near 12 % of the market, especially in modular stack assemblies. Dynamic seals, which accommodate both radial and axial movements in pump and valve applications, occupy the remaining 5 % and are driven by emerging high‑flow fuel‑cell systems. This type‑based market taxonomy highlights how material performance and mechanical requirements allocate revenue across the Hydrogen Fuel Cell Seals market.