LDPE is thermoplastic which is obtained from petroleum. It is a semi-rigid and translucent polymer. It has a density of 0.910-0.930g/cm3. The LDPE structure consists of bundled polymer chains which are placed in an irregular shape. It is perfectly flexible, it can be used at the temperature between −50 °C and 80 °C. The melting point of LDPE is about 120 °C.
It is generally used for trays and pots, long life bags and sacks, poly tunnels, protective sheeting, food bags etc. It is also used in wire & cable covering, computer parts such as disk drive, video cards. shrink wrap and container lids. permeation properties, as well as on IR-spectra of experimental five-layer food packaging films were studied. Films contained a middle buried layer of recycled LDPE comprising 25–50% by weight of the multilayer structure. Representative films containing 100% virgin LDPE as the buried layer were taken as controls.
