| http://www.w3.org/ns/prov#value | - The membrane is a permselective, composite membrane composed of a porous support and a nonporous, active membrane of a synthetic resin formed on the porous support, or is a permeable membrane having such characteristics that the nitrogen gas permeation rate at 30??? C. is in the range from 7???10???4 to 2???10???2 Nm3m2???h???atm and that the amount of permeated stream is 100 g/m2???h or less when
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