In Reply to: Ethanol diffusion through polypropylene posted by Lee Christel on April 05, 2007 at 23:55:10:

There is an analytical solution for the thermodynamical drive and diffusion coefficients of a 50% Ethanol / 50% Water mixture in high grade polypropylene polymer and multi layer materials (laminates / composite materials). Please do not hesitate tocontact us for more information.