Membrane Hydrophobic Membrane (PTFE) Support PP Color White Filter Surface Plain Thickness, μm 150~250 Width in rolls 255/260/510/520mm Pore Size, μm 0.01(for air), 0.05, 0.1, 0.22, 0.45, 1.0, 3.0, 5.0 Maximum Operating Pressure Forward: 4.2 bar @ 23