Inspection Methods >> Pressure Decay

Pressure Decay

Pressure Decay testers offer the dominant leak test method for empty bottle and container inspection.  Pressure Decay testers can be used for seal integrity or container integrity testing of Filled & Sealed Packages, if there is a significant volume if air inside the package.

Pressure Decay Leak Testing for Empty Bottle Inspection

ALPS Pressure Decay leak test curve example

The standard Pressure Decay tester uses a four step process for empty bottle inspection.

  1. The Pressure Decay tester extends a probe to create a leak tight seal on the container opening.
  2. The Pressure Decay tester fills the test volume to the desired pressure.  If the target pressure range is not achieved within a pre-defined time the product fails as a "gross leak."  If the pressure is achieved, the Pressure Decay tester records the Peak value.
  3. The Pressure Decay tester measures the pressure drop from the Peak to a defined initial Time (T1).  T1 can be used as stabilization time for flexible containers when longer test times are available.  The Pressure Decay tester rejects the product if the pressure drops beyond a pre-defined limit.
  4. The Pressure Decay tester measures the pressure drop from T1 to the end of the test (T2).  The Pressure Decay tester rejects the product if the pressure drops beyond a pre-defined limit.  This final test offers detection of the smallest leaks.

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