The Crimp-Top Headspace Vial Set is designed for laboratory chromatography and headspace analysis applications. Each set includes a 20mL clear flat-bottom glass vial, a 20mm aluminum crimp cap, and a 20mm PTFE/rubber septa for secure sample handling and instrument compatibility. The beveled top structure is designed to support stable cap sealing during crimping, while the flat bottom profile allows reliable placement in compatible analytical instruments. Crimp-top headspace vials are commonly used in GC and headspace analysis systems requiring secure sealing and consistent sample handling. The PTFE/rubber septa is designed for repeated needle penetration and temperature resistance from -60℃ to 200℃, making it suitable for routine laboratory workflows. PTFE/silicone or PTFE/rubber septa are widely used in headspace vial systems due to their sealing performance and compatibility with chromatography applications. Each package contains 10 clear crimp-top vials and 10 aluminum caps with septa, suitable for laboratory sample preparation and analytical use.