free sample gas chromatography vials with round bottom Aijiren-Headspace Vials for Sale 2021 - 12 - 06 Headspace Vials, 8mm, 2mL vial, glassManufactured with superior quality (Type , Class A) glass, they are available with a round bottom in sizes with usable volumes of 0mL or 2 Material: USP Type , Class A, 33 Borosilicate Glass Dimensions: 22.5 x 46mm