This research explores the fabrication of porous Hydroxyethyl Cellulose (HEC) membranes, characterized by their inherent

mechanical strength and freedom from additional additives. Employing a gas-based method, a 200-μm HEC fi lm was

cast and its permeance was examined under varying gas pressures. The experimental process involved systematic pressure

increments, revealing the formation of pores due to solvent evaporation during the drying phase and the subsequent weakening

of intermolecular bonds. As gas pressure increased, both the number and size of pores exhibited signifi cant growth,

establishing pressure as a critical factor infl uencing pore characteristics. Structural analysis through Fourier Transform

Infrared (FT-IR) spectroscopy demonstrated no chemical alterations during gas permeation, confi rming that pore formation

was purely a physical phenomenon. FT-IR further identifi ed specifi c peaks corresponding to the molecular structure

of HEC. Deconvolution analysis of the FT-IR data highlighted the absence of chemical changes in the ether and hydroxyl

functional groups, reaffi rming the physical nature of pore formation. Thermogravimetric Analysis (TGA) was employed to

assess thermal stability, revealing that HEC fi lms remained stable even at temperatures exceeding 300 °C. Notably, fi lms

subjected to the gas permeation process exhibited more rapid degradation, signifying alterations in their physical properties

due to pore formation.