의 크기에 영향 받는다.(0.1~10 μm) Porosity : 10~20%poreheatStretchingExtruded film or foil made from a ... of the components form a film -porous glass membranes can be preparedPhase inversion-가장 상업적으로 이용 용이 ... from the vapor phaseAn cast film, consisting of a polymer and solventPlaced in a vapor atmosphere