Bottle Septa,Caps & Bottle Seals|analytics-reagent bottle chemistry for sale HPLC/GC • NEW standard quality for HPLC and GC • Synthetic rubber,cleaner and softer than natural rubber • Relatively inexpensive • Temperature resistant from -40 ° C to 110 ° C • Punching discs (punched from sheet/roll material) Butyl (septa/stopper) Appliion: Headspace • In the absence of a PTFE