Airbag gas generators are tested by bombing. First the airbag igniter is subjected to helium overpressure, then it is tested in a vacuum chamber to measure how much helium escapes again from the test part.
The leak rate specification for airbag cold gas generators are somewhat higher. Their helium-argon mixture must maintain its overpressure for more than 10 or 15 years. To test for the corresponding even smaller helium leak rate of 10-7 mbar∙l/s, vacuum leak testing with the LDS3000 or the Modul1000 is the established method of testing.