Plate heat exchangers are an important part of heat exchange technology in process industry equipment. The elastomeric gasket that seals between the individual plate heat sinks is a wearing part and a part that is prone to aging under natural conditions. Its service life has an important influence on the service life of the plate heat exchanger. If these seals thermally harden and lose their original elasticity, the heat exchanger may not function properly. The following factors have a significant impact on the service life of elastomeric gaskets: