Shimadzu’s Guide to Vial Selection. Temperature limit for PTFE/Silicone septa: -60°C up to 200°C Part number Cap Septa Material & Color Septa Thickness Septa Durometer Size 220-97331-27 Red PP, Center hole Silicone (White)/PTFE (Red) 1.3 mm 45° shore A ND 9 (9mm) 220-97331-28 Red PP, Center hole PTFE (Red)/Silicone (White)/PTFE (Red), Slit