25mm/4.08cm². Pore size (µm) : 0.22/0.45. Process volume (ml) : 13mm<10ml. 25mm<100ml. Maximum Opearting Temperature : 130℃. Maximum Opearting Pressure (psi) : 87psi. PTFE membranes are inherently hydrophobic; they are ideal for the filtration of nonpolar liquids and gases. Very resistant to solvents as well as acids or bases.