Low density polyethylene (LDPE) is a thermoplastic made from ethylene monomer. This is the first polyethylene layer of Imperial Chemical Industries (ICI) manufactured in 1933 using a high-pressure process through a free polymerization. Its production uses the same method today.

LDPE Film Grade is determined by a density range of 0.910-0.940 g / cm3. It does not react at room temperature, except for strong oxidizing agents, and some solvents cause swelling. It can withstand continuous 80 ° C and 95 ° C temperatures for a short time. Made of translucent or opaque variants, it's quite flexible and tough.

LDPE has more branches (about 2% of carbon atoms) than HDPE, so its intermolecular forces (bipolar-bipolar attraction) are weak, its tension is lower, and Its resistance is higher. In addition, because its molecules are not tightly packed and less crystalline due to lateral branches, its density is lower.