Using the pressure decay method, the pack is pressurised to a small overpressure, typically 50 mbar, and the rate of pressure decay is monitored using a pressure transducer.

The Lippke 4500 machine testing the pressure on a foil pack.

Smithers uses a Lippke 4500 Package Testing System to determine the pressure loss over time in accordance with ASTM F2095 Method A and Method B (with or without restraining plates).

The method is capable of detecting microleaks, but is less sensitive when testing packages containing wet products as the leakage route can become 'plugged'.

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