ERIKS Sealing Technology - Eriks UK

18 Materials19ThermoplasticsStandard ERIKS Thermoplastic GradesPolytetrafluoroethylene(PTFE)PTFE is a thermoplastic polymer andnot an elastomer. PTFE is unaffectedFluoroethylene Propylene-Perfluoroalkoxy(FEP/PFA)This polymer is made from chemicallyPolyaryletheretherketone(PEEK)PEEK is a semicrystalline thermoplasticthat is physically strong and highlyMaterialReferenceDescriptionApplicationE400 Virgin Polytetrafluoroethylene (PTFE) Static, Low Duty Cycles.by virtually all known chemicals overa wide range of temperatures. PTFEmodified fluorocarbon copolymers.FEP is often used to encapsulateresistant to wear, hydrolysis and thermaldegradation. PEEK is available asE431Glass and Molybdenum Disulphide reinforced PTFEDynamic/Static, Medium Duty Cycles,Hardened Metal Running Surfaces.lacks elasticity which prevents its useas an elastomeric sealing ring, howeverother elastomers to increase chemicalresistance. FEP/PFA appears morenon-filled (‘Virgin’) grades and variousfilled grades which modify its physicalE471 Graphite reinforced PTFE Dynamic, Medium Duty Cycles.it is commonly used for anti-extrusionas a back-up ring and for non-stickrequirements. Non-filled (‘Virgin’) gradesare stable up to +260°C and quiteflexible and resistant to breaking undertensile and compression stresses. PTFEis available as various filled grades toenhance its physical characteristics.Typical filler types include:n 15-25% glass-filled for improveddeformation and wearn 25% carbon-filled for considerablewear and deformation improvementn 15% graphite-filled to lower thelike a plastic than a rubber; they areextremely resilient and have excellentchemical resistance but they havea lower melting point than PTFE.FEP/PFA has a moderate abrasionresistance but have excellent nonstickcharacteristics. Their temperaturerange is approximately –100°C to+200/250°C for FEP/PFA respectively.FKM cores are typically used forgas applications due to lower gaspermeability, otherwise VMQare typical.characteristics.n Virgin PEEK has excellentmechanical properties at hightemperatures, excellent chemicalresistance, low moisture absorption,good wear and abrasion resistancen Glass-filled grades have increasedcompression strength and shearstrength at higher temperaturesn Carbon-filled grades haveenhanced compressionstrength, tensile strengthand wear-resistanceE462 Carbon/Graphite reinforced PTFE Dynamic, Medium Duty Cycles.E491E282ZV1V2V3V4Ekonol reinforced PTFECarbon/Graphite/PPS reinforced PTFEPEEK 450VirginPEEK 450 CA30Carbon filledPEEK 450 GL30Glass FilledPEEK 450 FC30LubricatedDynamic/Static, Medium to High Duty Cycles,Minimum 45 HRc Running Surface.Dynamic/Static, High Duty Cycles,Hardened Metal Running Surfaces.Back-up RingsDynamic Anti-extrusion Elements/Bearings.BearingsBearingscoefficient of frictionn 40% bronze-filled for excellentwear, deformation strength, thermalconductivity (reduced chemicalresistance)Polymer backbone