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Pre-cutsepta:ThesiliconematerialiscutthroughinY-formwhilethePTFElayerremainsuncut.Thesiliconelayerrepresents95%ofthetotalseptathicknesswhilethePTFElayerisonly5%orless.TheY-formshapeofthecutwaschosenforseveralreasons.SincethePTFElayerisuncut,thisproductprovidesprotectionagainstcontaminationuntiltheneedlePiercesthroughit.TheneedlecaneasilypenetratethroughtheY-slitoftheseptamaterial(onlythethicknessofthePTFElayerneedstobepenetratedbytheneedle).Lesspressureisrequiredfortheautosamplerneedletopenetratethepre-cutsepta,resultinginfewerbentand/orbrokenneedles.TheuncutPTFElayerprovidesabettersealthanothercommerciallysolidslittedseptauntiltheneedlepuncturesthesepta.TheY-shapedcutallowsairtoenerthevialeliminatingvacuumformation.Thedesignprovidestheneedlewithalargertargetareaforpenetrationevenwhentheneedledoesn′tcomedowninthecenterofthesepta.
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