Reliability evaluation of shelf ageing EPR

It is of great importance to predict future property of shelf aging ethylene propylene rubber (EPR) as sealing materials since it is often delayed to be applied in engineering practice. Tensile strength data collected from each re-inspection in the past few years is dispersive so that current methods to predict future property of EPR are not accurate. A new method utilizing reliability evaluation technology is presented in this paper to predict the property of tensile strength of EPR in storage, which gives the point estimate and interval estimate of storage reliability to illustrate the change of EPR performance well.