All DWK Life Sciences chromatography vials are made from clear or amber borosilicate glass, which conforms to USP Type I and ASTM E438, Type I, Class B requirements. Two types of application: HPLC : The most common vial sizes for liquid chromatography vials are 12 x 32 mm as well as 15 x 45 mm. 12 x 32 mm vials will also be described as 1.5 mL, 1.8 mL or 2.0 mL vials.