Guidance in the use of seal strength test EN 868-5.pdf

Guidance in the use of Seal Strength Test EN 868-5, Annex D


Round Robin Tests have shown that seal strength measurements using the
method outlined in EN 868-5 Annex D may show significant differences in the
resulting values even if the same sample specimens are tested and the test
method is followed as described.

It has been found out that the following circumstances are of influence on the
results and thus that the standard requirements should be strictly adhered to.

• Test equipment setting: the separating speed must be kept exactly at
200mm / min.

• The specimen’s tail must not be supported: depending on the
materials, supporting or not supporting the specimen’s tail can
influence the measurement and the results significantly.

• Test equipment setting: the frequency of measurements and the
number of data documented and used for the calculation of peak- and
average values of the seal strength is of importance. For example, a
measuring frequency of 50 hz will deliver for a 10mm wide seal