Pack integrity - pressure decay method

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.

Pira uses a Skye PT2000 packtester which interprets the pressure decay curve and expresses the result as a "single equivalent hole diameter", reported directly in microns.

The method employed is similar to, but not in accordance with, the pressure decay leak test for non-porous flexible packages without restraining plates described in ASTM F2095 test method A.

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