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==Materials used==
Plastic wrap was initially created from polyvinyl chloride ([[Polyvinyl chloride|PVC]]), which remains the most common component globally. PVC has an acceptably-low permeability to water vapor and oxygen,<ref>{{Cite book|url=https://books.google.com/books?id=-kO5CgAAQBAJ&q=pvc%2520cling%2520film%2520permeability&pg=PA488|title=Food: The Chemistry of its Components: 6th Edition|last=Coultate|first=Tom|date=2015-08-17|publisher=Royal Society of Chemistry|isbn=9781849738804|url-status=live|archive-url=https://web.archive.org/web/20160428065131/https://books.google.co.th/books?id=-kO5CgAAQBAJ&pg=PA488&lpg=PA488&dq=pvc+cling+film+permeability&source=bl&ots=b5SHT3RVQ2&sig=33Cn0KRsLcwYeheOqGGISAN9KC4&hl=en&sa=X&ved=0ahUKEwiNt9jixOrLAhVGA44KHbK6CGUQ6AEINDAE#v=onepage&q=pvc%2520cling%2520film%2520permeability&f=false|archive-date=2016-04-28}}</ref> helping to preserve the freshness of food. There are concerns about the transfer of [[plasticizers]] from PVC into food. [[Pliofilm]] was various kinds of rubber chloride, used in the middle 20th century because it could be heat-sealed.<ref>{{Cite web|title=Pliofilm {{!}} Encyclopedia.com|url=https://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/pliofilm|access-date=2021-01-13|website=www.encyclopedia.com}}</ref>
A common, cheaper alternative to PVC is [[low-density polyethylene]] (LDPE). It is less adhesive than PVC, but this can be remedied by adding [[linear low-density polyethylene]] (LLDPE), which also increases the film's [[tensile strength]].<ref>{{Cite journal|last1=Krishnaswamy|first1=Rajendra K.|last2=Lamborn|first2=Mark J.|date=2000|title=Tensile properties of linear low density polyethylene (LLDPE) blown films|url=https://onlinelibrary.wiley.com/doi/abs/10.1002/pen.11370|journal=Polymer Engineering & Science|language=en|volume=40|issue=11|pages=2385–2396|doi=10.1002/pen.11370|issn=1548-2634}}</ref>
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