Mar 03, 2022 · Sep 10, 2020 · As we all known, 20ml Headspace Vial is mainly for Gas chromatography analysis. 18mm screw headspace vial and 20mm crimp headspace vial are equipped to different autosampler. 20ml Headspace Vial is available in clear or amber glass. According to analyte, clear and amber glass headspace vials are selected.