Ensure optimal sample integrity and reliable analysis with the ASIGC Headspace Cap Designed for gas chromatography (GC) headspace applications this 20mm aluminum crimp seal provides a secure closure for headspace vials preventing contamination and ensuring airtight sealing The PTFE/White Silicone septa combination offers excellent chemical resistance minimizing interference while maintaining sample purity High-Quality Aluminum Crimp Cap Provides a tight secure seal for reliable analysis PTFE/White Silicone Septa Chemically resistant low-bleed septa ideal for GC applications Optimal Performance Ensures minimal contamination and maintains sample integrity Versatile Compatibility Fits standard 20mm headspace vials used in various laboratory and analytical applications Pack Size 100 caps per pack for convenience and efficiency Perfect for chromatographic laboratories pharmaceutical testing environmental analysis and food safety applications the ASIGC Headspace Cap delivers hig