2ml sample vial are made of high quality borosilicic acid glass,low screw cap including silicon septa and PTFE ideal for compound sample storage in the Get Price. VERTICAL CHROMATOGRAPHY CO.,LTD. : HPLC COLUMNS GC. Amber Glass Spot, Blue Open Top Cap and PTFE/Silicone Septa Glass Spot, 12x32mm, 9mm Screw Thread, Blue, Bonded Interseal with ...