English to Russian Tech/Engineering Engineering: Industrial Определение времени до начала разрушения ПЭ труб под долгосрочным гидростатическим давлением

A series of at least four such tests of five specimens each are performed at succeedingly lower pressures to establish a stress rupture time curve. Mean failure times of 10, 100, 1,000, and 10,000 hours are desirable targets for the establishment of a characteristic curve. Longer times are more desirable.

Испытание по ASTM: https://fa.parsethylene-kish.com/UserFiles/Uploads/Standards...

10, 100, 1000 и 10 000 часов – это контрольные значения? Явно ведь не целевые.