Why a Strong Peel Result Can Coexist With a Leaking Seal

A strip samples only part of the seal

A peel test measures the force needed to separate a cut strip of bonded flexible material under a defined setup. On a sealed sample pouch, the tested strip can carry substantial force while a narrow channel crosses the seal a short distance away. A channel within the strip can also leave bonded material on either side to carry much of the load.

Map the strip and check continuity

Record where each strip came from, along with its width, test setup and failure mode. A leak check on the intact package addresses whether a path can be detected under the chosen conditions. Use separate matching specimens if the method requires cutting the seal before the peel measurement.

For an intermittent defect at a fold or corner, include that position in the investigation. A strong result elsewhere establishes the strength observed in that test strip. The leak result has its own detection limit and does not measure peel force.

Packaging sample showroom of SamBound New Material Technology Company Ltd. (sambound.com).

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