Polyethylene is the simplest of the synthetic polymers and is the most common among the plastic materials. It's usally indicated by the acronym "PE". Its chemical formula is (-C2H4-)n where n can arrive up to several million. Chains can vary in length and ramification. Polyethylene is a thermoplastic resin, it looks like a transparent solid (amorphous consistance) or white (crystalline consistance), it has excellent insulating characteristics and chemical stability. It's a very versatile material and one of the most economic plastic materials; it's usually used as electric cable insulator, plastic bags, holders, pipings, internal strattum of aseptic holders for feed liquids ("Tetra Brik Aseptic") and lots more.