Some people hold that equal-pressure method is superior to differential-pressure method in terms of test efficiency, which proves to be incorrect. Such opinion correlates with people’s misunderstanding about test duration and test efficiency of gas permeability testing. This article analyzes test efficiency of gas permeability testing based on the characteristics of the test. Based on current testing technology, this article also analyzes test efficiency of differential-pressure method and equal-pressure method.

Test efficiency of differential-pressure method instruments is on a par with that of equal-pressure method instruments both in aspects of test methods and in connection with specific tester. Differential-pressure method instruments can satisfy actual test requirements. It is not correct and not practical for some documents to say that test efficiency of equal-pressure method possesses higher test efficiency.