Dense inorganic membranes The production scale-up of polymers for commercial polymeric membranes will unlikely experience any issues. Dense inorganic membranes such as those proposed for pre-combustion capture consist of a metal film on a ceramic support. One of the more promising alloys for this application is palladiumsilver. These membranes are currently used to provide ultra-high purity hydrogen for laboratory and semiconductor applications, which are small throughput applications. Large capacity units have not been demonstrated.