selective membranes for gas barrier

[floosh]

any polymeric sheets that are selectively permeable to water but not to larger (50-150 m.w.) gas molecules?

 

[polimers]

Hi, the barriers propiertyes of polymers are limited,but if you for example, one lamination with aluminium foil + polymer ,have excelent barriers al oxigen,co2 an another gases.But only materials polymeric is very dificult.