Caps for roals chals-ka waxaa laga heli karaa ha ahaato god furan oo loogu talagalay isticmaalka autosampler-ka iyo isku-darka caadiga ah ama dusha adag ee salka lagu keydiyo. Teflon iyo caalikone-ka silicone ama silic-ultra-silicone saafi ah waxaa loo isticmaalaa sida ashyaa'da ceeriin ah si loo hubiyo in Septa ay sun-sunta ah; Si loo hubiyo shaqooyin aad u wanaagsan, waxay si gaar ah ugu habboon tahay koromada gaaska, iyo in la hubiyo in sepum uusan ku dhicin muunadda finanka inta lagu gudajiro mudista.
Nidaamka isku-darka-ee-sharaf-la'aanta ayaa loo isticmaalaa in lagu daro xuubka polytetraftluethylene iyo silsiladda silicon caag ah ama silsilad silicone ah si loo ilaaliyo si loo ilaaliyo astaamaha ugu fiican ee labada aaladda. Lakabka polytetrafluethylen ee septum-ka iswaafajiya ee septum-ka waxay la xiriirtaa reagent. Waa kiimiko ahaaneed oo u adkaysta aashitada, alkali, heerkulka, iyo ismiishalka. Ma shaqeyso aashitada uruurinta, waxay si xoogan u ururisay alkali, ama ogid xoog leh xitaa heerkulka sare. Isla mar ahaantaana, xargaha caasinimada silicone-ka ama lakabka silicone-ka ayaa hubin kara waxqabadka shaabadaynta.