Water Vapour Transfer through Microporous Membranes and Polyester Textiles at Combinations of Temperature and Pressure that Simulate Elevated Altitudes

摘要

The water vapour permeability resistances of a commercial polytetrafluoroethylene (PTFE) membrane and some general polyester (PET) textiles were measured at simulated altitude conditions, whose temperature and pressure were both controlled simultaneously. The experiment was carried out using a simple apparatus in which the effect of the air layer could be eliminated on either side of the test specimen.