Which liner should be used for secondary containment, Poly-Flex HDPE or LLDPE? Why?
Poly-Flex HDPE liners are preferred because most secondary containment projects are for emergency containment of chemicals at high concentrations, such as fuels and acids. The Poly-Flex HDPE liners provide a higher degree of chemical resistance as compared to LLDPE liners. • Can Poly-Flex liners be used for potable water applications? Yes. Poly-Flex liners do not contain any plasticizers or fillers, and are therefore safe for potable water applications. • 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
