2—THE MOISTURE-VAPOUR PERMEABILITY OF TEXTILE FABRICS

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Abstract
The current ‘dish’ techniques for measuring the moisture-vapour permeability of textile fabrics are slow and tedious. A new approach, based on the measurement of the relative-humidity gradient in a closed linear system, is described. This Resistance Tube provides results that are equivalent to those of the dish techniques but requires less than one-third of the time for a determination and is much easier to accomplish. The sensitivity achieved is currently about one-half that of the dish method and is considered adequate for practical use. In addition, there is a potential for improving the Resistance Tube to the point where it has a sensitivity equal to, or greater than, that of the dish techniques. An important advantage of the new method is the fact that it can be used to investigate the permeability of composite specimens, as encountered in a practical clothing system.

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