The screw thread of 13-425 HPLC Vial produced by Aijiren ensures the tightness of the HPLC Vial and ensures that the sample is not volatile. The Screw thread is also the most convenient type in HPLC Vial. 4ml 13-425 Screw HPLC Vials for Aijiren. Aijiren’s 2ml Glass Vials can be