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[[File:Polypropylene.svg|thumb|left|upright=0.9|The repeating unit of the polymer polypropylene]]
[[File:Expanded polystyrene foam dunnage.jpg|thumb|Expanded polystyrene polymer packaging]]
[[Polymer]]s are chemical compounds made up of a large number of identical components linked together like chains.<ref>{{Cite web |date=2017-10-13 |title=Explainer: What are polymers? |url=https://www.snexplores.org/article/explainer-what-are-polymers |access-date=2024-05-02 |language=en-US}}</ref>
Polyvinyl chloride (PVC) is widely used, inexpensive, and annual production quantities are large. It lends itself to a vast array of applications, from [[artificial leather]] to [[electrical insulation]] and cabling, [[packaging]], and [[Food storage|containers]]. Its fabrication and processing are simple and well-established. The versatility of PVC is due to the wide range of [[plasticiser]]s and other additives that it accepts.<ref>{{Cite journal |last1=Bernard |first1=L. |last2=Cueff |first2=R. |last3=Breysse |first3=C. |last4=Décaudin |first4=B. |last5=Sautou |first5=V. |date=2015-05-15 |title=Migrability of PVC plasticizers from medical devices into a simulant of infused solutions |url=https://www.sciencedirect.com/science/article/pii/S037851731500246X |journal=International Journal of Pharmaceutics |language=en |volume=485 |issue=1 |pages=341–347 |doi=10.1016/j.ijpharm.2015.03.030 |pmid=25796128 |issn=0378-5173}}</ref> The term "additives" in polymer science refers to the chemicals and compounds added to the polymer base to modify its material properties.
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