2020/6/19 · Aijiren 2ml HPLC Vial have been tested numerous times, which are fully compatible with common chromatography analytical instruments on the market. In the laboratory, we often see the 9mm screw cap and septa in unit. In fact, the 9mm HPLC vial's cap was produced by special process. The septa is made of PTFE, silicone and rubber.