| αi/j | Membrane selectivity of gas i to gas j |
| CEM | Controlled evaporator and mixing device |
| CH4 | Methane |
| CO2 | Carbon dioxide |
| GC | Gas chromatograph |
| GPS | Gas permeation setup |
| GPU | Gas permeation unit |
| He | Helium |
| HMDSO | Hexamethyldisiloxane |
| MFC | Mass flow controller |
| MOF | Metal organic framework |
| N2 | Nitrogen |
| PAN | Polyacrylonitrile |
| PDMS | Polydimethylsiloxane |
| PECVD | Plasma-enhanced chemical vapor deposition |
| T | Temperature (°C) |
| TDP | dew point temperature (°C) |
| P | Pressure (bar) |
| XPS | X-ray photoelectron spectroscopy |
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