What is the elongation or deformation limits of Poly-Flex HDPE and LLDPE geomembranes before they rupture?
In the multi-axial tension test, ASTM D 5617, the HDPE liners rupture at 15% elongation and the LLDPE liners rupture at 30% elongation. • Does thickness affect the elongation or deformation limits? Generally, the elongation property of Poly-Flex liners are independent of the material thickness. Although thinner liners deform with less pressure, the ultimate elongation at rupture is nearly the same for all gauges. • Does material thickness influence puncture resistance? Yes. Thicker liners have higher puncture resistance than the thinner ones. • How is the thickness of a liner determined for a specific application? In the case of landfills, U.S.E.P.A. mandates that all landfill liners must be 60 mil or thicker. Poly-Flex 40 mil geomembranes are preferred for landfill closures. The liner thickness is determined by the project engineer based on the project site specific conditions. • How are Poly-Flex liners held in place on side slopes? The most common method of securing the liners on si
