Sample 2: Re-washed 9 mm screw thread vials were provided in amber glass Sample 3: ™New ThermoScientific™ National clear-glass, 9 mm vials (C4000-1W) and new closures with PTFE/silicone septa (C5000-54B) were provided as baseline reference samples. Authors Loy Shick, Thermo Fisher Scientific, Rockwood, TN, USA