Dec 2, 2021 · Home » News » 20ml screw headpace vials » Sigma 20ml thread gc vials with round bottom for lab test Sigma 20ml thread gc vials with round 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 Payment: T/T MOQ: 1 pack