Perkin Elmer 20ml headspace vials online Headspace Crimp/Screw Top Vials, 20 mm, PerkinElmer | VWR These headspace vials are manufactured from Type I borosilicate glass, which meets all USP, JP, and EP Pharmacopeia requirements.Designed to use separating organic and inorganic compounds for analysis, chromatography vials come in differen