![]() ![]() By examining the aged samples, both the property changes and the responsible degradation mechanisms were characterised. Furthermore, leakage rate was measured to detect seal failure. For assessing the relaxation and recovery behaviour of the ageing seals, compression stress relaxation and compression set experiments were performed. hardness and tensile behaviour as well as dynamic-mechanical and thermogravimetric analyses were conducted. For investigating the changes of material properties during ageing, measurements of i.a. For this reason, ageing experiments with O-rings and sheets based on hydrogenated acrylonitrile butadiene rubber (HNBR), ethylene propylene diene rubber (EPDM) and fluorocarbon rubber (FKM) were performed over up to two years at different temperatures. Therefore, it is necessary to be able to predict the lifetime of such seals reliably. In some applications, elastomer seals have to remain leak tight over extended time periods (up to several decades) as an exchange of the seals is not practical. ![]() ![]() International Nuclear Information System (INIS) Aging and lifetime prediction of O-ring seals ![]()
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