Amapangidwa ndi utomoni wa polyethylene ndi ethylene copolymer ngati zida zopangira ndikuwonjezera zowonjezera zosiyanasiyana.Ili ndi mawonekedwe a anti-seepage coefficient, kukhazikika kwamankhwala abwino, kukana kukalamba, kukana mizu ya zomera, phindu lazachuma, liwiro la zomangamanga, kuteteza chilengedwe komanso kusakhala ndi poizoni.