Abstract
A study was made of the effect of pressure and temperature on the permeability of polyethylene and fluoroplastic specimens of different porosites in relation to helium, argon, nitrogen and carbon tetrachloride. Results of investigation are interpreted on the basis of Knudsen-Poiseuille rules and activated diffusion law. A ratio was derived which describes the superimpositions of these rules and enables porosity to be determined also average radius and number capillaries per unit area established. It was shown that heat treatment of a porous specimen reduces the radius and number of capillaries and therefore gas permeability. The difference of temperature relations of gas permeability factors in activated diffusion, capillary flow or the superimposition of these transfer effects was indicated.
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