This article argues that pressure difference exists on two sides of specimen not only in differential-pressure method, but also in equal-pressure method. Continue reading
Based on ISO and national standards of various countries concerning gas permeability testing, this article expounds on the issues that appear in the application of those standards. It also analyzes the disadvantages of some standards. Continue reading
Based on the characteristics of sensor method and vacuum method, this article gives packaging enterprises, testing institutes and research institutes some suggestions on how to select gas permeability test methods. Continue reading
It is argued in this article that due to the reverse transmission of nitrogen gas in equal-pressure method, there is essential difference between differential-pressure method and equal-pressure method in terms of test principle. Continue reading
This article reviews the parameter definition as well as the development of test methods concerning water vapor permeability testing. Continue reading