Long-term durability is assessed by burst pressure tests conducted at constant pressures until rupture. Data plotted on log-log graphs allow statistical derivation of the Minimum Required Strength (MRS), representing 50-year expected strength per ISO standards.
Elongation testing measures material ductility, indicative of proper extrusion processing and gelation. Achieving elongations around 80% reflects optimal tie-molecule network formation essential for long-term mechanical stability.