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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/?id=-kO5CgAAQBAJ&pg=PA488&lpg=PA488&dq=pvc+cling+film+permeability#v=onepage&q=pvc%2520cling%2520film%2520permeability&f=false|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|archiveurl=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|archivedate=2016-04-28}}</ref> helping to preserve the freshness of food. There are concerns about the transfer of [[plasticizers]] from PVC into food.
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>{{
In the US and Japan, plastic wrap is sometimes produced using [[polyvinylidene chloride]] (PVdC), though some brands, such as [[Saran (plastic)|Saran]] wrap, have switched to other formulations due to environmental concerns.<ref>{{Cite news|url=http://host.madison.com/business/ceo-explains-why-sc-johnson-made-saran-wrap-less-sticky/article_8987a920-fec9-5567-8b47-3067b3f83ff6.html|title=CEO Explains Why SC Johnson Made Saran Wrap Less Sticky, Hurting Sales|first=Michael|last=Burke|work=Madison.com|access-date=2017-06-20|url-status=live|archiveurl=https://web.archive.org/web/20170620202432/http://host.madison.com/business/ceo-explains-why-sc-johnson-made-saran-wrap-less-sticky/article_8987a920-fec9-5567-8b47-3067b3f83ff6.html|archivedate=2017-06-20}}</ref>
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