Can Poly-Flex liners of different densities be welded to each other?
Yes. Welding temperature adjustments must be made to achieve a successful weld. When extrusion welding, the lower density welding rod should be used. • Can Poly-Flex seams be tested for leaks? How? Yes. Poly-Flex seams are non-destructively tested over 100% of the seam length for leaks. The most common method is the air pressure test for dual wedge seams. The vacuum box test is used for extrusion welds. • Can Poly-Flex liners be installed directly on top of concrete slabs or asphalt pavement? Yes. Concrete and asphalt slabs must be smooth and have no sharp edges. • Can Poly-Flex liners be attached to fixed structures such as concrete, steel, pipes, etc? How? Yes. Poly-Flex liners can be attached to fixed structures through a number of methods. With concrete structures, two methods are preferred. The first, to be used in new structures, is the Poly-Flex polyethylene embed channel (PEC). This channel can be inserted into a new concrete structure, providing for a three inch HDPE surface t
