| http://www.w3.org/ns/prov#value | - A membrane comprising: a polyurethane including a polyester polyol, said membrane having a durability of at least 200,000 cycles under a KIM test analysis, wherein said membrane is in the form of a closed container having an average wall thickness of 18 mils and is inflated with nitrogen gas to 20.0 psig. 70.
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