Headspace vials 22 ml | Sigma-Aldrich Product Description. SDS. 27177. white tan PTFE/silicone, diam. × total thickness × PTFE thickness 18 mm × 0.060 in. × 5 mil, for use with 22 mL vial, pkg of 100 ea. Pricing. 23193-U. white tan PTFE/silicone, diam. × thickness 22 mm × 0.125 in., for use with 20, 40 or 60 mL vial, pkg of 100 ea. 20 mm Headspace Vials, Septum, and Caps Thermo