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What (who) is polythene - definition
![pill box]] presented to a technician at ICI in 1936 made from the first pound of polyethylene](https://commons.wikimedia.org/wiki/Special:FilePath/First polythene pillbox.JPG?width=200 "pill box]] presented to a technician at ICI in 1936 made from the first pound of polyethylene")
![The repeating unit within polyethylene in the most stable [[staggered conformation]]](https://commons.wikimedia.org/wiki/Special:FilePath/Polyethylene-repeat-2D.png?width=200 "The repeating unit within polyethylene in the most stable [[staggered conformation]]")
![A recyclable bag manufactured from polyethylene, [[resin identification code]]](https://commons.wikimedia.org/wiki/Special:FilePath/Polyethylene.jpg?width=200 "A recyclable bag manufactured from polyethylene, [[resin identification code]]")
![''Say no to polythene.'' Sign. [[Nako, Himachal Pradesh]], India.](https://commons.wikimedia.org/wiki/Special:FilePath/Say no to polythene. Sign. Nako, H.P. India.jpg?width=200 "''Say no to polythene.'' Sign. [[Nako, Himachal Pradesh]], India.")
.jpg?width=200 "Stainless steel and ultra high molecular weight polyethylene hip replacement")
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Wikipedia
Polyethylene or polythene (abbreviated PE; IUPAC name polyethene or poly(methylene)) is the most commonly produced plastic. It is a polymer, primarily used for packaging (plastic bags, plastic films, geomembranes and containers including bottles, etc.). As of 2017, over 100 million tonnes of polyethylene resins are being produced annually, accounting for 34% of the total plastics market.
Many kinds of polyethylene are known, with most having the chemical formula (C2H4)n. PE is usually a mixture of similar polymers of ethylene, with various values of n. It can be low-density or high-density: low-density polyethylene is extruded using high pressure (1,000–5,000 atm (100–510 MPa)) and high temperature (520 K (247 °C; 476 °F)), while high-density polyethylene is extruded using low pressure (6–7 atm (610–710 kPa)) and low temperature (333–343 K (60–70 °C; 140–158 °F)). Polyethylene is usually thermoplastic, but it can be modified to become thermosetting instead, for example, in cross-linked polyethylene.
