In accordance with ISO 11607, Part 2, the sealing seams must show the following quality characteristics within the Operational Qualification—intact seal for a specified seal width; no channels or open seals; no punctures or tears; and no material delamination or separation. With the hawotest Seal Check, an indicator strip shows whether these quality features are fulfilled. A subjective interpretation of the seal seam is excluded, regardless of the type of sealing device. An optimum seal seam can only be guaranteed if such critical parameters as sealing temperature and sealing pressure are correctly set and adjusted to the material to be sealed. If one of these parameters shows a deviation, this is visible on the indicator strip.