Patent ID: 8394181

Claim:
A permselective material comprising a polymer having an organosiloxane skeleton and containing a dispersed solid additive, wherein when oxygen and nitrogen are passed through a membrane comprising the permselective material, the relation between the permeability coefficients [cm 3 ·cm·sec −1 ·cm −2 ·cmHg −1 ] of oxygen and nitrogen at a temperature of 23±2° C. under a pressure difference of 1.05 atm to 1.20 atm through the membrane is expressed by Formula (1): 0.94 ≤ P ⁡ ( O 2 ) P ⁡ ( N 2 ) < 1 ( 1 ) where P(O 2 ) denotes the permeability coefficient of oxygen, while P(N 2 ) denotes the permeability coefficient of nitrogen.