2020/06/19 · 2ml HPLC Vial has different mouth type, such as screw top, snap top and crimp top. Among those 2ml HPLC Vial, 9mm screw vial is the most popular. Because 9mm 2ml screw HPLC vial can compatible with Aijiren, Waters, Shimadzu instrument and so on. Some analytical systems are optimized for performance with proprietary processes and components.