| ASTM | American Society of Testing Materials |
| Δp | Applied pressure (Pa) |
| Δd | Differential pore diameter (m) |
| CFP | Capillary flow porometry |
| dp | Pore diameter (m) |
| dp,avg | Mean pore diameter (m) |
| dp,mode | Mode pore diameter (m) |
| dp,avg,fl | Mean pore diameter based in permeability (flux) (m) |
| dp,avg,nr | Mean pore diameter based in number (m) |
| FFP | Fluid fluid porometer |
| GLDP | Gas–liquid displacement porosimetry |
| IFTS | Institut de la Filtration et des Techniques Séparatives |
| J | Volume flow (m3/s) |
| L | Permeability (m3 /Pa/s) |
| ΔL | Increment of permeability (m3 /Pa/s) |
| LLDP | Liquid–liquid displacement porosimetry |
| MF | Microfiltration |
| MWCO | Molecular weight cut-off (Da) |
| NF | Nanofiltration |
| PC | Personal computer |
| PES | Polyethersulfone |
| PSD | Pore size distribution |
| SEM | Scanning electron microscopy |
| UF | Ultrafiltration |
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