Enhanced Water Vapor Permeability Tester for High Barrier Materials

摘要

Continuous developments in high barrier materials have extended beyond the lower measuring limits of commercially available permeability testers, necessitating improvements in measurement sensitivity. By applying relatively minormodifica-tions to the Dynamic Relative Humidity measurement method for Water Vapor Permeability, significant improvements have been achieved, including a reduction of the lower measurement limit by one order of magnitude, faster testing cycles, and improvements in testing reproducibility and repeatability. In this presentation, we first review the Dynamic Relative Humidity measurement method and present the theory behind the changes made. We then provide some comparative testing data, which illustrates the improved sensitivity and faster measurements achieved for several high barrier films.