Head of Physical Testing - Packaging
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After initiating de-lamination between the relevant film plies, the average force required to peel the two 'legs' of the test piece is recorded. A static loading methodology is also used when the issue relates to long term creep failure.
Although usually determined at ambient laboratory conditions, Smithers is able to determine such tensile properties at sub-ambient or elevated temperatures using a 'hot box' attachment to the tensile test apparatus.
This is essentially the same test procedure as that described in ASTM F88 used to determine seal strength, however the lamination bond strength testing is completed to ASTM F904.