Autosampler vials are a specific type of vial used by autosamplers for automated sample retrieval and injection into HPLC, GC or MS analytical instrumentation. Autosampler vial caps (also known as vial closures or seals), can be screw cap, crimp cap or snap closures, but whatever their type, it is important that they offer a secure, tight seal to prevent sample leakage, evaporation and