borosil HPLC Vials & Caps with screw caps for hplc system borosil chromatography vials | Sigma-Aldrichblack polypropylene hole cap, 10-425 thread, PTFE/silicone, septum thickness . Email : market@aijirenvial.com. Tel : 8618057059123. Home About Products . 1-4mL Autosampler Vials for HPLC, UPLC, GC . 16mm, 25mm Test Tubes for Water Analysis