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This paper describes a procedure to measure the permeability <i>P</i>, diffusivity <i>D,</i> and rate of adsorption <i>k₁</i>, thus determining the solubility <i>S</i> and rate of desorption <i>k₂</i> of He, N₂, O₂, CH₄, and CO₂ on a polydimethylsiloxane (PDMS) membrane. The described procedure is able to determine experimentally all the physical quantities that characterize the gas transport process through a thin rubber polymer membrane. The experiments were carried out at room temperature and at a transmembrane pressure of 1 atm. The results are in good agreement with the available data in the literature and offer an evaluation of <i>k₁</i> and <i>k₂</i>.