Mesh size of Flexible Resin?

Hi All

For my research project; I am planning to print something with the flexible resin and use it as a separator for two different compartments. These compartments will have O2, N2, CO2 and maybe liquid water.

Do you think, any molecule will be able to diffuse in and out from one chamber to another? (gas and liquid phase)

Or is the mesh size of the flexible resin pretty small for molecules to diffuse in and out

Thanks !