Home » News » 20ml screw headpace vials » Perkin Elmer 18mm thread gc vials with flat bottom for lab test Perkin Elmer 18mm thread gc vials with flat bottom for lab test Material: USP Type 1, Class A, 33 Borosilicate Glass Dimensions: 22.5 x 46mm/22.5 x 75mm Application: GC system Neck Diameter: 18mm Qty/Pack: 100pcs/pack Volume: 10-20ml