The ASI20mL Screw Top Headspace Vial is designed for precision efficiency and reliability in chromatography applications These pre-assembled vials include 18mm magnetic precision open-top screw caps with blue PTFE/white silicone septa ensuring a secure fit while minimizing preparation time Proper cap and septa selection are essential for maintaining sample integrity and preventing contamination making these vials a dependable choice for laboratories requiring accuracy and consistency Applications Alkali Scientifics screw top headspace vials are ideal for gas chromatography (GC) and high-performance liquid chromatography (HPLC) particularly in headspace sampling techniques used to analyze volatile compounds Common applications include Environmental Analysis Detecting contaminants in water air and soil samples Food and Beverage Testing Identifying aroma compounds in food spices and beverages Pharmaceutical Quality Control Ensuring the purity and consistency of pharmaceutical formul