20mm Aluminum Crimp Cap with PTFE/Silicone Septa, 100-Pack 

These premium 20mm aluminum crimp caps feature a natural PTFE/blue silicone septum engineered for demanding analytical applications. The ultra-low bleed formulation ensures minimal background interference, making these caps ideal for GC, GC-MS, and other sensitive chromatographic analyses. Perfect for sealing headspace vials, sample storage containers, and crimp-top vials in pharmaceutical, environmental, and research laboratory settings.

• Septum Composition: Natural PTFE face with blue silicone backing for excellent chemical resistance and resealing capability
• Septum Thickness: 0.123" (3.12mm) for reliable needle penetration and secure sealing
• Ultra-Low Bleed Formula: Minimizes extractables and background noise in sensitive analytical methods
• Cap Material: High-quality aluminum construction ensures consistent crimping and secure closure
• Compatible Applications: Headspace analysis, GC/GC-MS sample preparation, and volatile compound storage
• Convenient Packaging: 100 caps per pack for laboratory efficiency and inventory management
• P/N: 4570-122