Within the Gas Separation Membranes segmentation by type, polymeric membranes dominate with an estimated 55 % of global sales, owing to their low cost, scalable manufacturing, and proven performance in CO₂ and H₂ separations. Inorganic membranes, primarily ceramic and zeolite‑based, capture about 18 % of the market; their thermal stability and resistance to harsh chemicals make them suitable for high‑temperature processes in petrochemical refining. Mixed‑matrix membranes, which embed selective fillers into polymer matrices, are rapidly expanding and now represent roughly 15 % of revenue, driven by superior selectivity‑permeability trade‑offs for specialty gas streams. Metallic membranes, chiefly palladium‑based for hydrogen purification, hold a modest 7 % share, reflecting niche applications where ultra‑high purity is essential. Emerging graphene‑derived membranes, still in early commercialization, account for the remaining 5 % and are expected to reshape the market as production costs decline. Each type’s contribution aligns with its technological maturity, cost structure, and suitability for the identified applications.