Lenox Laser was recently involved in a study dedicated to testing the viability of an ASTM standard Vacuum Decay method of detecting leaks as put forth in their Abstract:
Preface: Vacuum decay, an ASTM standard method (F2338-09) has been well known in the industry as a reliable leak detection method for flexible non-porous pouches, as described in section 3.2.3i. Because the method-study for precision and bias has not been performed yet, as stated in section 1.2.5,ii this sometimes raises questions and doubts on the method itself. This paper can help to take away these questions and/or confusion/skepticism and provide some best practices and steps for product validation. To validate the vacuum decay method on flexible pouches, the most reliable ways are using capillaries or using a micro calibrator. Other methods might be cheaper, but cannot give reliable and reproducible results. In order to calculate flow rates, the Hagen-Poiseuille formula is explained. Moreover, the assumptions and limitations of this formula are covered.
Jobse, Pim & Renema, Andro. (2021). Verifying the Vacuum Decay Method with artificial leaks on flexible pouches.
If you are interested in learning more about this study, you can request the full-text PDF here.
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