ISO9080SEMDISK.COM

This standard describes a method for estimating the long-term hydrostatic strength of thermoplastics materials by statistical extrapolation. The method provides a systematic basis for the interpolation and extrapolation of stress rupture characteristics at operating conditions different from the conventional 50 years at 20°C... to estimate the lower prediction limit (at 97,5% of probability level) of the stress, which a pipe made of the material under consideration is able to withstand for 50 years at an ambient temperature of 20°C using water as test environment... estimate the value for the lower prediction limit (at 97,5% of probability level) of the stress, at either different times or different temperatures, or on occasion both.