The seal strength of the lidding on semi-rigid packs is a balance between consumer ease of opening and the retention of pack integrity.
Smithers Pira is able to test the mechanical seal strength of lidding films in accordance with ASTM F2824. The force required to separate the lid from the container is continuously measured as the lid is peeled at a constant 45° angle - to simulate consumer opening of the pack.
The 45° peel test is applicable to a variety of containers with flexible lids including, rigid thermoformed cups, injection-moulded cups and single serve containers.
In conjunction with integrity testing, it may be used in the validation of the sterile barrier system requirements of ISO 11607-2 for medical devices.
Smithers Pira is UKAS accredited for testing to ASTM F2824 and ISO 11607-2.