Pressure Decay

The integrity of non-porous packages can be tested using a pressure decay method. In this method the pack is pressurised to a small overpressure, typically 50 mbar, and the rate of pressure decay is monitored using a pressure transducer.

Smithers Pira 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".