Air tightness testing with air only? Helium, nitrogen, other gases... Choosing the right method is half the battle!
This article describes the selection of different gases for gas tightness testing and their corresponding detection methods. Air is not the only gas used in hermeticity testing. Commonly used gases are helium, hydrogen, air and nitrogen. Helium and hydrogen are commonly used tracer gases for tracer gas concentration based testing; air and nitrogen are commonly used for pressure/flow rate change based testing.