Home / silanized 20ml headspace vials for gas chromatography silanized 20ml headspace vials for gas chromatography Direct Growth of Bacteria in Headspace Vials Allows for The headspace vials used in this study were 75.5 × 22.5mm, 20mL, screw neck, clear glass vials (Gerstel Inc., Linthicum, MD, USA, product number #093640-036-00) with 20ml amber vials for gc analysis–Lab Vials Manufacturer