This test method provides an evaluation of the quality of an in-line sealing process on a real time basis for sealed packages. It eliminates the need to expose the specimen to long exposures of high pressure to drive the helium gas into the package to later be detected by the same method herein used. Previously, separate test methods were required to detect large or small leaks. This method provides only one test to accomplish all test levels without potential for specimens with leaks to escape detection within the range of detection being employed (see Practices F 98).

Both development and research, along with manufacturing control, may be served by using this test method. Current gross leak test methods and fine leak test methods may be combined into one using this method. No exposure to high pressure processing hazards is involved and safety of operation in production environment is enhanced.