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Look for a path across the seal
Packaging sample showroom of SamBound New Material Technology Company Ltd. (sambound.com).
In a suitable dye test for a nonporous seal, record whether the dye crosses the sealed width during the defined exposure. Inspect the undisturbed sample where the method permits it. Dye on a glove, a work surface or the outside of a closure can be carried to the inside when the sample is moved or opened.
Control how the sample is handled
Keep the test surface clean and apply and remove the dye consistently. Use an intact reference and a reference with a known channel to see how each behaves under the same procedure. Photograph the trace before disturbing the seal when possible. A smear or color gradient may guide inspection, but its shape alone cannot establish where the dye came from.
Use a fresh specimen if opening or handling made the result ambiguous. Record the exposure and the observed path. A dye test indicates passage under the selected conditions and does not measure a product leak rate.
sambound.com
SamBound New Material Technology Company Ltd.
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