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Components Seals Although it is difficult to produce a well-vulcanised product due to the restricted cross-linking chemistry, the development team did an excellent job. If you look at the stress relaxation curve according to DIN 52913, you can see how stable the behaviour of the gasket material is: The process of adapting to the applied pressing force only takes about as long until the test temperature is reached, after which the material is stable throughout the remaining test duration (Diagram 1). The compression curve according to EN 13555 also shows a uniform deformation process without a “crash point” up to a load limit of 200 MPa (Diagram 2). A load capacity of 200 MPa at room temperature without destruction means nothing to a layperson. The example of loading a ¾” gasket with the dimensions 24 x 16 mm with a weight of 5 tons is more likely. It shows a mechanically excellent product, which also meets the very latest hygienic requirements. Surface pressure [MPa] 220 200 180 160 140 120 100 80 60 40 20 0 0,00 0,02 0,04 0,06 0,08 0,10 0,12 0,14 0,16 0,18 0,20 0,22 0,24 0,26 0,28 0,30 TEMESfl.ai1 Klinger, 27.01.2022 Diagram 2: EN 13555 compression curve Conclusion for installers, planners, designers and developers For the responsible user of FA gaskets in drinking water, it is now time to initiate the conversion process to the officially required gasket quality. In the case of industrially produced components, devices and systems in the drinking water sector in particular, action must be taken now in or- EN 13555 Compression curve KLINGERSIL ® C 4240 92x49x2.0 mm Room temperature Deformation [mm] der to successfully complete the conversion process before the final date. With the new product, the necessary evidence can also be provided without great effort for components and devices that are to be newly certified. The right gasket material is available. The Author: Dipl.-Ing. Norbert Weimer, KLINGER GmbH Idstein, Germany 112 PROCESS TECHNOLOGY & COMPONENTS 2022
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