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==Applications==
PEEK is used to fabricate items for demanding applications, including [[Bearing (mechanical)|bearings]], [[piston]] parts, [[pumps]], [[high-performance liquid chromatography]] columns, compressor plate [[valves]], and [[electrical cable]] [[Electrical insulation|insulation]]. It is one of the few plastics compatible with [[ultra-high vacuum]] applications, which makes it suitable for aerospace, automotive, and chemical industries.<ref name=":0">{{Cite web|title=PEEK (Polyether Ether Ketone)|url=http://www.scientificspine.com/spinal-materials/peek.html|website=www.scientificspine.com|access-date=2020-05-06}}</ref> PEEK is used in [[medical implant]]s, for example in creating a partial replacement skull in neurosurgical applications.
PEEK is used in [[spinal fusion]] devices and reinforcing rods.<ref name="space probe use">{{cite web|last=Lauzon|first=Michael|title=Diversified Plastics Inc., PEEK playing role in space probe|url=http://www.plasticsnews.com/article/20120504/NEWS/305049956|work=PlasticsNews.com|publisher=[[Crain Communications Inc]]|date=May 4, 2012|access-date=May 6, 2012}}</ref> It is [[Radiodensity|radiolucent]], but it is hydrophobic causing it to not fully fuse with bone.<ref name=":0" /><ref>{{Cite web|title=10 Porous TLIF cages to Know...!|url=http://www.thespinemarketgroup.com/10-porous-tlif-cages-to-know/|date=2020-02-01|website=SPINEMarketGroup|language=en-US|access-date=2020-05-06}}</ref> PEEK seals and manifolds are commonly used in fluid applications. PEEK also performs well in high temperature applications (up to 500 °F/260 °C).<ref>{{cite web|title=Properties of PEEK Material|url=http://www.uplandfab.com/peek-machining|website=www.uplandfab.com}}</ref> Because of this and its low thermal conductivity, it is also used in [[fused filament fabrication]] (FFF) printing to thermally separate the hot end from the cold end.
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