The test is used to determine the stackability of packaging and packing materials during processing, transport and storage. The container is placed upright between the platens of the compression fixture and compressed. The compression force and platen travel are recorded until the required compression resistance and platen travel are reached, or until failure occurs due to critical deformation or leaking of the container. Since different results are achieved depending on whether the containers are empty or filled, both methods and the resulting compressive strengths are measured. The obtained data is extremely important for quality assurance, since it can be used to test the customer specification. If the container meets the high level requirements, it is released for series production. In 2018, the zwickiLine was replaced by a new testing machine, the ProLine. Operation of the zwickiLine was trouble-free and reliable right from the start. The testing machine, together with testXpert testing software left a sustainable impression, in turn making this an easy decision. “Since we have been very satisfied working with a ZwickRoell testing machine for years, we again chose ZwickRoell as our supplier,” said Daniel Makovich, Head of Technology/Design at KOSME. The newly acquired ProLine universal testing machine has taken over the test tasks previously carried out by the zwickLine, performing compression tests on plastic bottles for quality assurance purposes.