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. At last, the cap and septa was assembled in one unit. Aijiren, as 9mm 2ml HPLC Vial manufacturer, has used smart machine in produce progress.