This article reviews the parameter definition as well as the development of test methods concerning water vapor permeability testing. Continue reading
Based on its introduction to the definition of traceability and the source of referential material in gas permeability testing methods, this article discusses the fundamental position of differential-pressure method in gas permeability testing. Continue reading
Based on test principles of desiccant method and water method, this article analyzes differences of these two methods. It also discusses advantages and disadvantages of these two methods according to the development requirement of gravimetric method. Continue reading
This article introduces relevant calibration items of ASTM D 3985. The comparison of empirical tests has proved that test data of different-pressure method vary with that of equal-pressure method. Continue reading
This article elaborates on the calibration method of reference material calibration used by current equal-pressure method gas permeability testing, and analyzes practical application situations of reference material calibration. Continue reading