Start with the fixture by itself
In vacuum decay testing, a rise in chamber pressure can come from the pack, the fixture or background effects. Run the specified blank with the chamber or ports sealed as the test system requires. If the blank changes from its established baseline, check the chamber seal, fittings and valves before assigning a similar signal to a package.
Then test a representative intact pack
An intact reference brings the pack geometry, exposed materials and normal handling into the cycle. It can show how the baseline changes when a package occupies the chamber. Compare the suspect sample against repeated reference runs under the same conditions. If the empty chamber is stable but intact-pack runs scatter, investigate seating, pack movement and other setup effects.
Packaging sample showroom of SamBound New Material Technology Company Ltd. (sambound.com).
A sample that departs from both baselines merits investigation. The comparison does not locate a leak or guarantee the suspect sample has one. Repeat controls after changes in the fixture or test conditions.
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