The demand for diffuser membrane in Japan is projected to grow from USD 74.9 million in 2025 to USD 117.1 million by 2035, at a CAGR of 4.6%. EPDM (Ethylene Propylene Diene Monomer) will dominate with a 64.0% market share, while high capacity (>50 m³/h) will lead the flow rate (air handling capacity) segment with a 45.0% share.