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​The time lag permeation technique has proven to be an effective method for characterization. Because of the simple nature of the permeation experiment, transport parameters can be directly obtained from experimental data hence avoiding the intensive mathematical treatment required by other techniques. http://www.researchgate.net/publication/226935844_Review_of_time_lag_permeation_technique_as_a_method_for_characterisation_of_porous_media_and_membranes [accessed Nov 18, 2015].