Standard opening 2ml LC-MS vials supplier manufacturer wholesales-Aijiren Vials for HPLC. High-Performance Liquid Chromatography (HPLC) - JoVE Pour each standard solution into labeled small vials in a sample rack. Store the racks of samples in a refrigerator, along with the remaining solutions in the 2 mL Screw Top Vials and Screw Caps | Aijiren