Three-layered coextruded geomembranes composed of a core of very low density polyethylene (VLDPE) and skins of high density polyethylene (HOPE) possess a unique combination of properties. They have shown better puncture resistance and multiaxial elongation than HOPE and better tensile strength, tear resistance, and chemical resistance than VLDPE. This paper will present the results of recent constant load environmental stress crack resistance (CLESCR) tests that were performed on several coextruded products including textured sheet and two types of seams (fusion and extrusion). The results showed that coextruded geomembranes and seams have much better stress crack resistance than conventional HOPE geomembranes.
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