In the Types dimension, the market is stratified into polymeric, ceramic, and composite hollow‑fiber membranes, each with distinct performance envelopes that shape adoption curves. Polymeric fibers, chiefly fabricated from polysulfone, polyimide, and PTFE, capture roughly 70 % of sales due to their cost‑effectiveness, ease of scale‑up, and adequate selectivity for most industrial separations. Ceramic fibers, representing about 15 %, offer superior thermal stability and chemical resistance, making them indispensable for high‑temperature hydrogen recovery and aggressive acid‑gas streams, albeit at higher capital expense. Composite fibers, comprising a polymeric matrix reinforced with inorganic fillers such as zeolites or metal‑organic frameworks, occupy the remaining 15 %; they deliver tailored permeability‑selectivity trade‑offs that address emerging niche applications like CO2 capture from flue gas under variable conditions. The relative market shares of these types underscore the trade‑off between cost and performance, guiding manufacturers’ investment priorities and informing end‑user selection criteria across the Hollow Fiber Gas Separation Membrane segmentation landscape.